diff --git a/profiles/cclcc/savedata.lua b/profiles/cclcc/savedata.lua
index 7847fe1d9..959f4c666 100644
--- a/profiles/cclcc/savedata.lua
+++ b/profiles/cclcc/savedata.lua
@@ -156,4 +156,21 @@ root.SaveData = {
         {{0x20B}}, 
         {{0x20C}},
     }
-};
\ No newline at end of file
+};
+
+local scriptIds = {
+    KN01 = 38,
+    KN17 = 54,
+    KN18 = 55,
+};
+
+root.SaveData.EquivalentLines = {
+    {
+        {ScriptId = scriptIds.KN01, StartLineId = 387, EndLineId = 397},
+        {ScriptId = scriptIds.KN01, StartLineId = 483, EndLineId = 493},
+    },
+    {
+        {ScriptId = scriptIds.KN17, StartLineId = 0, EndLineId = 40},
+        {ScriptId = scriptIds.KN18, StartLineId = 0, EndLineId = 40},
+    },
+};
diff --git a/profiles/chlcc/equivalentlines.lua b/profiles/chlcc/equivalentlines.lua
new file mode 100644
index 000000000..09b3984ee
--- /dev/null
+++ b/profiles/chlcc/equivalentlines.lua
@@ -0,0 +1,725 @@
+local scriptIds = {
+    AA08 = 12,
+    AA09 = 13,
+    AA14 = 18,
+    AY03 = 27,
+    KO05 = 38,
+    NA02 = 45,
+    NA03 = 46,
+    RI01 = 53,
+    YU02A = 70,
+    YU02B = 71,
+    YU03A = 72,
+    YU03B = 73,
+    YU04A = 74,
+    YU04B = 75,
+    YU05A = 76,
+    YU05B = 77,
+    YU06A = 78,
+    YU06B = 79,
+    YU07A = 80,
+    YU07B = 81,
+    YU08A = 82,
+    YU08B = 83,
+    YU09A = 84,
+    YU09B = 85,
+};
+
+root.SaveData.EquivalentLines = {
+    {
+        {ScriptId = scriptIds.AA08, StartLineId = 80, EndLineId = 87},
+        {ScriptId = scriptIds.AA08, StartLineId = 217, EndLineId = 224},
+    },
+    {
+        {ScriptId = scriptIds.AA08, StartLineId = 88, EndLineId = 96},
+        {ScriptId = scriptIds.AA08, StartLineId = 231, EndLineId = 239},
+    },
+    {
+        {ScriptId = scriptIds.AA09, StartLineId = 205, EndLineId = 220},
+        {ScriptId = scriptIds.AA09, StartLineId = 296, EndLineId = 311},
+    },
+    {
+        {ScriptId = scriptIds.AA14, StartLineId = 442, EndLineId = 449},
+        {ScriptId = scriptIds.AA14, StartLineId = 500, EndLineId = 507},
+    },
+    {
+        {ScriptId = scriptIds.AY03, StartLineId = 22, EndLineId = 35},
+        {ScriptId = scriptIds.KO05, StartLineId = 18, EndLineId = 31},
+    },
+    {
+        {ScriptId = scriptIds.AY03, StartLineId = 51, EndLineId = 57},
+        {ScriptId = scriptIds.NA03, StartLineId = 249, EndLineId = 255},
+    },
+    {
+        {ScriptId = scriptIds.NA02, StartLineId = 340, EndLineId = 346},
+        {ScriptId = scriptIds.RI01, StartLineId = 184, EndLineId = 190},
+    },
+    {
+        {ScriptId = scriptIds.YU02A, StartLineId = 0, EndLineId = 2},
+        {ScriptId = scriptIds.YU02B, StartLineId = 0, EndLineId = 2},
+    },
+    {
+        {ScriptId = scriptIds.YU02A, StartLineId = 4, EndLineId = 98},
+        {ScriptId = scriptIds.YU02B, StartLineId = 3, EndLineId = 97},
+    },
+    {
+        {ScriptId = scriptIds.YU03A, StartLineId = 0, EndLineId = 14},
+        {ScriptId = scriptIds.YU03B, StartLineId = 0, EndLineId = 14},
+    },
+    {
+        {ScriptId = scriptIds.YU03A, StartLineId = 16, EndLineId = 24},
+        {ScriptId = scriptIds.YU03B, StartLineId = 16, EndLineId = 24},
+    },
+    {
+        {ScriptId = scriptIds.YU03A, LineId = 26},
+        {ScriptId = scriptIds.YU03B, LineId = 26},
+    },
+    {
+        {ScriptId = scriptIds.YU03A, LineId = 28},
+        {ScriptId = scriptIds.YU03B, LineId = 28},
+    },
+    {
+        {ScriptId = scriptIds.YU03A, StartLineId = 31, EndLineId = 33},
+        {ScriptId = scriptIds.YU03B, StartLineId = 31, EndLineId = 33},
+    },
+    {
+        {ScriptId = scriptIds.YU03A, StartLineId = 35, EndLineId = 36},
+        {ScriptId = scriptIds.YU03B, StartLineId = 35, EndLineId = 36},
+    },
+    {
+        {ScriptId = scriptIds.YU03A, StartLineId = 38, EndLineId = 39},
+        {ScriptId = scriptIds.YU03B, StartLineId = 38, EndLineId = 39},
+    },
+    {
+        {ScriptId = scriptIds.YU03A, StartLineId = 41, EndLineId = 42},
+        {ScriptId = scriptIds.YU03B, StartLineId = 41, EndLineId = 42},
+    },
+    {
+        {ScriptId = scriptIds.YU03A, StartLineId = 44, EndLineId = 46},
+        {ScriptId = scriptIds.YU03B, StartLineId = 44, EndLineId = 46},
+    },
+    {
+        {ScriptId = scriptIds.YU03A, LineId = 49},
+        {ScriptId = scriptIds.YU03B, LineId = 49},
+    },
+    {
+        {ScriptId = scriptIds.YU03A, StartLineId = 53, EndLineId = 57},
+        {ScriptId = scriptIds.YU03B, StartLineId = 53, EndLineId = 57},
+    },
+    {
+        {ScriptId = scriptIds.YU03A, LineId = 60},
+        {ScriptId = scriptIds.YU03B, LineId = 60},
+    },
+    {
+        {ScriptId = scriptIds.YU03A, StartLineId = 62, EndLineId = 71},
+        {ScriptId = scriptIds.YU03B, StartLineId = 62, EndLineId = 71},
+    },
+    {
+        {ScriptId = scriptIds.YU03A, StartLineId = 73, EndLineId = 95},
+        {ScriptId = scriptIds.YU03B, StartLineId = 73, EndLineId = 95},
+    },
+    {
+        {ScriptId = scriptIds.YU03A, StartLineId = 97, EndLineId = 125},
+        {ScriptId = scriptIds.YU03B, StartLineId = 97, EndLineId = 125},
+    },
+    {
+        {ScriptId = scriptIds.YU03A, StartLineId = 129, EndLineId = 154},
+        {ScriptId = scriptIds.YU03B, StartLineId = 129, EndLineId = 154},
+    },
+    {
+        {ScriptId = scriptIds.YU03A, StartLineId = 155, EndLineId = 160},
+        {ScriptId = scriptIds.YU03B, StartLineId = 156, EndLineId = 161},
+    },
+    {
+        {ScriptId = scriptIds.YU03A, StartLineId = 162, EndLineId = 169},
+        {ScriptId = scriptIds.YU03B, StartLineId = 163, EndLineId = 170},
+    },
+    {
+        {ScriptId = scriptIds.YU03A, StartLineId = 171, EndLineId = 184},
+        {ScriptId = scriptIds.YU03B, StartLineId = 172, EndLineId = 185},
+    },
+    {
+        {ScriptId = scriptIds.YU03A, LineId = 186},
+        {ScriptId = scriptIds.YU03B, LineId = 187},
+    },
+    {
+        {ScriptId = scriptIds.YU03A, StartLineId = 188, EndLineId = 216},
+        {ScriptId = scriptIds.YU03B, StartLineId = 188, EndLineId = 216},
+    },
+    {
+        {ScriptId = scriptIds.YU03A, StartLineId = 218, EndLineId = 229},
+        {ScriptId = scriptIds.YU03B, StartLineId = 218, EndLineId = 229},
+    },
+    {
+        {ScriptId = scriptIds.YU03A, StartLineId = 231, EndLineId = 250},
+        {ScriptId = scriptIds.YU03B, StartLineId = 231, EndLineId = 250},
+    },
+    {
+        {ScriptId = scriptIds.YU03A, StartLineId = 252, EndLineId = 254},
+        {ScriptId = scriptIds.YU03B, StartLineId = 252, EndLineId = 254},
+    },
+    {
+        {ScriptId = scriptIds.YU03A, StartLineId = 257, EndLineId = 259},
+        {ScriptId = scriptIds.YU03B, StartLineId = 257, EndLineId = 259},
+    },
+    {
+        {ScriptId = scriptIds.YU04A, StartLineId = 0, EndLineId = 8},
+        {ScriptId = scriptIds.YU04B, StartLineId = 0, EndLineId = 8},
+    },
+    {
+        {ScriptId = scriptIds.YU04A, StartLineId = 11, EndLineId = 23},
+        {ScriptId = scriptIds.YU04B, StartLineId = 11, EndLineId = 23},
+    },
+    {
+        {ScriptId = scriptIds.YU04A, LineId = 26},
+        {ScriptId = scriptIds.YU04B, LineId = 26},
+    },
+    {
+        {ScriptId = scriptIds.YU04A, LineId = 28},
+        {ScriptId = scriptIds.YU04B, LineId = 28},
+    },
+    {
+        {ScriptId = scriptIds.YU04A, LineId = 30},
+        {ScriptId = scriptIds.YU04B, LineId = 30},
+    },
+    {
+        {ScriptId = scriptIds.YU04A, LineId = 32},
+        {ScriptId = scriptIds.YU04B, LineId = 32},
+    },
+    {
+        {ScriptId = scriptIds.YU04A, StartLineId = 34, EndLineId = 51},
+        {ScriptId = scriptIds.YU04B, StartLineId = 34, EndLineId = 51},
+    },
+    {
+        {ScriptId = scriptIds.YU04A, StartLineId = 53, EndLineId = 65},
+        {ScriptId = scriptIds.YU04B, StartLineId = 53, EndLineId = 65},
+    },
+    {
+        {ScriptId = scriptIds.YU04A, StartLineId = 68, EndLineId = 70},
+        {ScriptId = scriptIds.YU04B, StartLineId = 68, EndLineId = 70},
+    },
+    {
+        {ScriptId = scriptIds.YU04A, StartLineId = 72, EndLineId = 88},
+        {ScriptId = scriptIds.YU04B, StartLineId = 72, EndLineId = 88},
+    },
+    {
+        {ScriptId = scriptIds.YU04A, StartLineId = 90, EndLineId = 93},
+        {ScriptId = scriptIds.YU04B, StartLineId = 90, EndLineId = 93},
+    },
+    {
+        {ScriptId = scriptIds.YU04A, StartLineId = 95, EndLineId = 96},
+        {ScriptId = scriptIds.YU04B, StartLineId = 95, EndLineId = 96},
+    },
+    {
+        {ScriptId = scriptIds.YU04A, StartLineId = 99, EndLineId = 102},
+        {ScriptId = scriptIds.YU04B, StartLineId = 98, EndLineId = 101},
+    },
+    {
+        {ScriptId = scriptIds.YU04A, LineId = 104},
+        {ScriptId = scriptIds.YU04B, LineId = 103},
+    },
+    {
+        {ScriptId = scriptIds.YU04A, StartLineId = 106, EndLineId = 107},
+        {ScriptId = scriptIds.YU04B, StartLineId = 105, EndLineId = 106},
+    },
+    {
+        {ScriptId = scriptIds.YU04A, StartLineId = 109, EndLineId = 112},
+        {ScriptId = scriptIds.YU04B, StartLineId = 108, EndLineId = 111},
+    },
+    {
+        {ScriptId = scriptIds.YU04A, StartLineId = 116, EndLineId = 118},
+        {ScriptId = scriptIds.YU04B, StartLineId = 114, EndLineId = 116},
+    },
+    {
+        {ScriptId = scriptIds.YU04A, LineId = 120},
+        {ScriptId = scriptIds.YU04B, LineId = 118},
+    },
+    {
+        {ScriptId = scriptIds.YU04A, StartLineId = 122, EndLineId = 124},
+        {ScriptId = scriptIds.YU04B, StartLineId = 120, EndLineId = 122},
+    },
+    {
+        {ScriptId = scriptIds.YU04A, StartLineId = 127, EndLineId = 130},
+        {ScriptId = scriptIds.YU04B, StartLineId = 125, EndLineId = 128},
+    },
+    {
+        {ScriptId = scriptIds.YU04A, StartLineId = 134, EndLineId = 135},
+        {ScriptId = scriptIds.YU04B, StartLineId = 132, EndLineId = 133},
+    },
+    {
+        {ScriptId = scriptIds.YU04A, LineId = 152},
+        {ScriptId = scriptIds.YU04B, LineId = 149},
+    },
+    {
+        {ScriptId = scriptIds.YU04A, StartLineId = 155, EndLineId = 158},
+        {ScriptId = scriptIds.YU04B, StartLineId = 153, EndLineId = 156},
+    },
+    {
+        {ScriptId = scriptIds.YU04A, LineId = 160},
+        {ScriptId = scriptIds.YU04B, LineId = 158},
+    },
+    {
+        {ScriptId = scriptIds.YU04A, StartLineId = 163, EndLineId = 164},
+        {ScriptId = scriptIds.YU04B, StartLineId = 161, EndLineId = 162},
+    },
+    {
+        {ScriptId = scriptIds.YU04A, LineId = 166},
+        {ScriptId = scriptIds.YU04B, LineId = 164},
+    },
+    {
+        {ScriptId = scriptIds.YU04A, StartLineId = 170, EndLineId = 172},
+        {ScriptId = scriptIds.YU04B, StartLineId = 168, EndLineId = 170},
+    },
+    {
+        {ScriptId = scriptIds.YU04A, StartLineId = 176, EndLineId = 177},
+        {ScriptId = scriptIds.YU04B, StartLineId = 174, EndLineId = 175},
+    },
+    {
+        {ScriptId = scriptIds.YU04A, LineId = 179},
+        {ScriptId = scriptIds.YU04B, LineId = 177},
+    },
+    {
+        {ScriptId = scriptIds.YU04A, StartLineId = 181, EndLineId = 185},
+        {ScriptId = scriptIds.YU04B, StartLineId = 179, EndLineId = 183},
+    },
+    {
+        {ScriptId = scriptIds.YU04A, LineId = 193},
+        {ScriptId = scriptIds.YU04B, LineId = 190},
+    },
+    {
+        {ScriptId = scriptIds.YU04A, StartLineId = 196, EndLineId = 202},
+        {ScriptId = scriptIds.YU04B, StartLineId = 193, EndLineId = 199},
+    },
+    {
+        {ScriptId = scriptIds.YU04A, StartLineId = 204, EndLineId = 205},
+        {ScriptId = scriptIds.YU04B, StartLineId = 201, EndLineId = 202},
+    },
+    {
+        {ScriptId = scriptIds.YU04A, LineId = 209},
+        {ScriptId = scriptIds.YU04B, LineId = 207},
+    },
+    {
+        {ScriptId = scriptIds.YU04A, LineId = 212},
+        {ScriptId = scriptIds.YU04B, LineId = 210},
+    },
+    {
+        {ScriptId = scriptIds.YU04A, StartLineId = 214, EndLineId = 215},
+        {ScriptId = scriptIds.YU04B, StartLineId = 212, EndLineId = 213},
+    },
+    {
+        {ScriptId = scriptIds.YU04A, StartLineId = 217, EndLineId = 226},
+        {ScriptId = scriptIds.YU04B, StartLineId = 215, EndLineId = 224},
+    },
+    {
+        {ScriptId = scriptIds.YU04A, LineId = 228},
+        {ScriptId = scriptIds.YU04B, LineId = 226},
+    },
+    {
+        {ScriptId = scriptIds.YU04A, LineId = 231},
+        {ScriptId = scriptIds.YU04B, LineId = 229},
+    },
+    {
+        {ScriptId = scriptIds.YU04A, LineId = 234},
+        {ScriptId = scriptIds.YU04B, LineId = 232},
+    },
+    {
+        {ScriptId = scriptIds.YU04A, StartLineId = 236, EndLineId = 239},
+        {ScriptId = scriptIds.YU04B, StartLineId = 234, EndLineId = 237},
+    },
+    {
+        {ScriptId = scriptIds.YU04A, StartLineId = 241, EndLineId = 247},
+        {ScriptId = scriptIds.YU04B, StartLineId = 239, EndLineId = 245},
+    },
+    {
+        {ScriptId = scriptIds.YU04A, StartLineId = 251, EndLineId = 258},
+        {ScriptId = scriptIds.YU04B, StartLineId = 248, EndLineId = 255},
+    },
+    {
+        {ScriptId = scriptIds.YU04A, StartLineId = 260, EndLineId = 262},
+        {ScriptId = scriptIds.YU04B, StartLineId = 257, EndLineId = 259},
+    },
+    {
+        {ScriptId = scriptIds.YU04A, LineId = 264},
+        {ScriptId = scriptIds.YU04B, LineId = 261},
+    },
+    {
+        {ScriptId = scriptIds.YU04A, StartLineId = 266, EndLineId = 267},
+        {ScriptId = scriptIds.YU04B, StartLineId = 263, EndLineId = 264},
+    },
+    {
+        {ScriptId = scriptIds.YU04A, StartLineId = 269, EndLineId = 271},
+        {ScriptId = scriptIds.YU04B, StartLineId = 266, EndLineId = 268},
+    },
+    {
+        {ScriptId = scriptIds.YU04A, LineId = 273},
+        {ScriptId = scriptIds.YU04B, LineId = 270},
+    },
+    {
+        {ScriptId = scriptIds.YU04A, StartLineId = 275, EndLineId = 287},
+        {ScriptId = scriptIds.YU04B, StartLineId = 272, EndLineId = 284},
+    },
+    {
+        {ScriptId = scriptIds.YU05A, StartLineId = 0, EndLineId = 23},
+        {ScriptId = scriptIds.YU05B, StartLineId = 0, EndLineId = 23},
+    },
+    {
+        {ScriptId = scriptIds.YU05A, StartLineId = 26, EndLineId = 29},
+        {ScriptId = scriptIds.YU05B, StartLineId = 26, EndLineId = 29},
+    },
+    {
+        {ScriptId = scriptIds.YU05A, StartLineId = 31, EndLineId = 38},
+        {ScriptId = scriptIds.YU05B, StartLineId = 31, EndLineId = 38},
+    },
+    {
+        {ScriptId = scriptIds.YU05A, LineId = 40},
+        {ScriptId = scriptIds.YU05B, LineId = 40},
+    },
+    {
+        {ScriptId = scriptIds.YU05A, StartLineId = 43, EndLineId = 45},
+        {ScriptId = scriptIds.YU05B, StartLineId = 43, EndLineId = 45},
+    },
+    {
+        {ScriptId = scriptIds.YU05A, StartLineId = 48, EndLineId = 60},
+        {ScriptId = scriptIds.YU05B, StartLineId = 48, EndLineId = 60},
+    },
+    {
+        {ScriptId = scriptIds.YU05A, StartLineId = 62, EndLineId = 74},
+        {ScriptId = scriptIds.YU05B, StartLineId = 62, EndLineId = 74},
+    },
+    {
+        {ScriptId = scriptIds.YU05A, StartLineId = 76, EndLineId = 77},
+        {ScriptId = scriptIds.YU05B, StartLineId = 76, EndLineId = 77},
+    },
+    {
+        {ScriptId = scriptIds.YU05A, StartLineId = 79, EndLineId = 85},
+        {ScriptId = scriptIds.YU05B, StartLineId = 79, EndLineId = 85},
+    },
+    {
+        {ScriptId = scriptIds.YU05A, StartLineId = 87, EndLineId = 91},
+        {ScriptId = scriptIds.YU05B, StartLineId = 87, EndLineId = 91},
+    },
+    {
+        {ScriptId = scriptIds.YU05A, LineId = 93},
+        {ScriptId = scriptIds.YU05B, LineId = 93},
+    },
+    {
+        {ScriptId = scriptIds.YU05A, LineId = 95},
+        {ScriptId = scriptIds.YU05B, LineId = 95},
+    },
+    {
+        {ScriptId = scriptIds.YU05A, StartLineId = 99, EndLineId = 100},
+        {ScriptId = scriptIds.YU05B, StartLineId = 99, EndLineId = 100},
+    },
+    {
+        {ScriptId = scriptIds.YU05A, LineId = 102},
+        {ScriptId = scriptIds.YU05B, LineId = 102},
+    },
+    {
+        {ScriptId = scriptIds.YU05A, StartLineId = 105, EndLineId = 106},
+        {ScriptId = scriptIds.YU05B, StartLineId = 105, EndLineId = 106},
+    },
+    {
+        {ScriptId = scriptIds.YU05A, StartLineId = 108, EndLineId = 121},
+        {ScriptId = scriptIds.YU05B, StartLineId = 109, EndLineId = 122},
+    },
+    {
+        {ScriptId = scriptIds.YU05A, StartLineId = 124, EndLineId = 127},
+        {ScriptId = scriptIds.YU05B, StartLineId = 125, EndLineId = 128},
+    },
+    {
+        {ScriptId = scriptIds.YU05A, StartLineId = 129, EndLineId = 132},
+        {ScriptId = scriptIds.YU05B, StartLineId = 130, EndLineId = 133},
+    },
+    {
+        {ScriptId = scriptIds.YU05A, StartLineId = 134, EndLineId = 148},
+        {ScriptId = scriptIds.YU05B, StartLineId = 135, EndLineId = 149},
+    },
+    {
+        {ScriptId = scriptIds.YU05A, StartLineId = 150, EndLineId = 152},
+        {ScriptId = scriptIds.YU05B, StartLineId = 151, EndLineId = 153},
+    },
+    {
+        {ScriptId = scriptIds.YU05A, StartLineId = 154, EndLineId = 157},
+        {ScriptId = scriptIds.YU05B, StartLineId = 155, EndLineId = 158},
+    },
+    {
+        {ScriptId = scriptIds.YU05A, LineId = 159},
+        {ScriptId = scriptIds.YU05B, LineId = 160},
+    },
+    {
+        {ScriptId = scriptIds.YU05A, StartLineId = 161, EndLineId = 165},
+        {ScriptId = scriptIds.YU05B, StartLineId = 162, EndLineId = 166},
+    },
+    {
+        {ScriptId = scriptIds.YU05A, StartLineId = 168, EndLineId = 176},
+        {ScriptId = scriptIds.YU05B, StartLineId = 169, EndLineId = 177},
+    },
+    {
+        {ScriptId = scriptIds.YU06A, StartLineId = 0, EndLineId = 6},
+        {ScriptId = scriptIds.YU06B, StartLineId = 0, EndLineId = 6},
+    },
+    {
+        {ScriptId = scriptIds.YU06A, StartLineId = 8, EndLineId = 9},
+        {ScriptId = scriptIds.YU06B, StartLineId = 8, EndLineId = 9},
+    },
+    {
+        {ScriptId = scriptIds.YU06A, StartLineId = 20, EndLineId = 22},
+        {ScriptId = scriptIds.YU06B, StartLineId = 23, EndLineId = 25},
+    },
+    {
+        {ScriptId = scriptIds.YU06A, StartLineId = 24, EndLineId = 32},
+        {ScriptId = scriptIds.YU06B, StartLineId = 27, EndLineId = 35},
+    },
+    {
+        {ScriptId = scriptIds.YU06A, LineId = 34},
+        {ScriptId = scriptIds.YU06B, LineId = 37},
+    },
+    {
+        {ScriptId = scriptIds.YU06A, StartLineId = 36, EndLineId = 54},
+        {ScriptId = scriptIds.YU06B, StartLineId = 39, EndLineId = 57},
+    },
+    {
+        {ScriptId = scriptIds.YU06A, LineId = 56},
+        {ScriptId = scriptIds.YU06B, LineId = 59},
+    },
+    {
+        {ScriptId = scriptIds.YU06A, LineId = 58},
+        {ScriptId = scriptIds.YU06B, LineId = 61},
+    },
+    {
+        {ScriptId = scriptIds.YU06A, LineId = 60},
+        {ScriptId = scriptIds.YU06B, LineId = 63},
+    },
+    {
+        {ScriptId = scriptIds.YU06A, StartLineId = 62, EndLineId = 66},
+        {ScriptId = scriptIds.YU06B, StartLineId = 65, EndLineId = 69},
+    },
+    {
+        {ScriptId = scriptIds.YU06A, StartLineId = 68, EndLineId = 84},
+        {ScriptId = scriptIds.YU06B, StartLineId = 71, EndLineId = 87},
+    },
+    {
+        {ScriptId = scriptIds.YU06A, StartLineId = 86, EndLineId = 87},
+        {ScriptId = scriptIds.YU06B, StartLineId = 89, EndLineId = 90},
+    },
+    {
+        {ScriptId = scriptIds.YU06A, StartLineId = 89, EndLineId = 90},
+        {ScriptId = scriptIds.YU06B, StartLineId = 92, EndLineId = 93},
+    },
+    {
+        {ScriptId = scriptIds.YU06A, LineId = 92},
+        {ScriptId = scriptIds.YU06B, LineId = 95},
+    },
+    {
+        {ScriptId = scriptIds.YU06A, LineId = 94},
+        {ScriptId = scriptIds.YU06B, LineId = 97},
+    },
+    {
+        {ScriptId = scriptIds.YU06A, LineId = 96},
+        {ScriptId = scriptIds.YU06B, LineId = 99},
+    },
+    {
+        {ScriptId = scriptIds.YU06A, StartLineId = 98, EndLineId = 102},
+        {ScriptId = scriptIds.YU06B, StartLineId = 101, EndLineId = 105},
+    },
+    {
+        {ScriptId = scriptIds.YU06A, StartLineId = 108, EndLineId = 111},
+        {ScriptId = scriptIds.YU06B, StartLineId = 111, EndLineId = 114},
+    },
+    {
+        {ScriptId = scriptIds.YU06A, StartLineId = 115, EndLineId = 118},
+        {ScriptId = scriptIds.YU06B, StartLineId = 118, EndLineId = 121},
+    },
+    {
+        {ScriptId = scriptIds.YU06A, LineId = 120},
+        {ScriptId = scriptIds.YU06B, LineId = 123},
+    },
+    {
+        {ScriptId = scriptIds.YU06A, StartLineId = 122, EndLineId = 127},
+        {ScriptId = scriptIds.YU06B, StartLineId = 125, EndLineId = 130},
+    },
+    {
+        {ScriptId = scriptIds.YU06A, StartLineId = 129, EndLineId = 138},
+        {ScriptId = scriptIds.YU06B, StartLineId = 132, EndLineId = 141},
+    },
+    {
+        {ScriptId = scriptIds.YU06A, LineId = 140},
+        {ScriptId = scriptIds.YU06B, LineId = 143},
+    },
+    {
+        {ScriptId = scriptIds.YU07A, StartLineId = 0, EndLineId = 1},
+        {ScriptId = scriptIds.YU07B, StartLineId = 0, EndLineId = 1},
+    },
+    {
+        {ScriptId = scriptIds.YU07A, StartLineId = 3, EndLineId = 5},
+        {ScriptId = scriptIds.YU07B, StartLineId = 3, EndLineId = 5},
+    },
+    {
+        {ScriptId = scriptIds.YU07A, StartLineId = 7, EndLineId = 9},
+        {ScriptId = scriptIds.YU07B, StartLineId = 7, EndLineId = 9},
+    },
+    {
+        {ScriptId = scriptIds.YU07A, StartLineId = 13, EndLineId = 17},
+        {ScriptId = scriptIds.YU07B, StartLineId = 14, EndLineId = 18},
+    },
+    {
+        {ScriptId = scriptIds.YU07A, StartLineId = 19, EndLineId = 24},
+        {ScriptId = scriptIds.YU07B, StartLineId = 20, EndLineId = 25},
+    },
+    {
+        {ScriptId = scriptIds.YU07A, StartLineId = 29, EndLineId = 33},
+        {ScriptId = scriptIds.YU07B, StartLineId = 33, EndLineId = 37},
+    },
+    {
+        {ScriptId = scriptIds.YU07A, StartLineId = 35, EndLineId = 38},
+        {ScriptId = scriptIds.YU07B, StartLineId = 39, EndLineId = 42},
+    },
+    {
+        {ScriptId = scriptIds.YU07A, StartLineId = 41, EndLineId = 99},
+        {ScriptId = scriptIds.YU07B, StartLineId = 47, EndLineId = 105},
+    },
+    {
+        {ScriptId = scriptIds.YU07A, StartLineId = 102, EndLineId = 105},
+        {ScriptId = scriptIds.YU07B, StartLineId = 108, EndLineId = 111},
+    },
+    {
+        {ScriptId = scriptIds.YU07A, StartLineId = 106, EndLineId = 108},
+        {ScriptId = scriptIds.YU07B, StartLineId = 113, EndLineId = 115},
+    },
+    {
+        {ScriptId = scriptIds.YU07A, StartLineId = 111, EndLineId = 112},
+        {ScriptId = scriptIds.YU07B, StartLineId = 118, EndLineId = 119},
+    },
+    {
+        {ScriptId = scriptIds.YU07A, LineId = 116},
+        {ScriptId = scriptIds.YU07B, LineId = 123},
+    },
+    {
+        {ScriptId = scriptIds.YU07A, StartLineId = 118, EndLineId = 119},
+        {ScriptId = scriptIds.YU07B, StartLineId = 125, EndLineId = 126},
+    },
+    {
+        {ScriptId = scriptIds.YU07A, StartLineId = 121, EndLineId = 129},
+        {ScriptId = scriptIds.YU07B, StartLineId = 128, EndLineId = 136},
+    },
+    {
+        {ScriptId = scriptIds.YU07A, StartLineId = 132, EndLineId = 146},
+        {ScriptId = scriptIds.YU07B, StartLineId = 140, EndLineId = 154},
+    },
+    {
+        {ScriptId = scriptIds.YU07A, StartLineId = 148, EndLineId = 152},
+        {ScriptId = scriptIds.YU07B, StartLineId = 156, EndLineId = 160},
+    },
+    {
+        {ScriptId = scriptIds.YU07A, StartLineId = 155, EndLineId = 159},
+        {ScriptId = scriptIds.YU07B, StartLineId = 163, EndLineId = 167},
+    },
+    {
+        {ScriptId = scriptIds.YU07A, StartLineId = 161, EndLineId = 163},
+        {ScriptId = scriptIds.YU07B, StartLineId = 169, EndLineId = 171},
+    },
+    {
+        {ScriptId = scriptIds.YU07A, StartLineId = 167, EndLineId = 179},
+        {ScriptId = scriptIds.YU07B, StartLineId = 175, EndLineId = 187},
+    },
+    {
+        {ScriptId = scriptIds.YU07A, StartLineId = 181, EndLineId = 198},
+        {ScriptId = scriptIds.YU07B, StartLineId = 189, EndLineId = 206},
+    },
+    {
+        {ScriptId = scriptIds.YU08A, StartLineId = 0, EndLineId = 26},
+        {ScriptId = scriptIds.YU08B, StartLineId = 0, EndLineId = 26},
+    },
+    {
+        {ScriptId = scriptIds.YU08A, StartLineId = 28, EndLineId = 30},
+        {ScriptId = scriptIds.YU08B, StartLineId = 28, EndLineId = 30},
+    },
+    {
+        {ScriptId = scriptIds.YU08A, LineId = 32},
+        {ScriptId = scriptIds.YU08B, LineId = 32},
+    },
+    {
+        {ScriptId = scriptIds.YU08A, StartLineId = 34, EndLineId = 54},
+        {ScriptId = scriptIds.YU08B, StartLineId = 33, EndLineId = 53},
+    },
+    {
+        {ScriptId = scriptIds.YU08A, StartLineId = 57, EndLineId = 62},
+        {ScriptId = scriptIds.YU08B, StartLineId = 56, EndLineId = 61},
+    },
+    {
+        {ScriptId = scriptIds.YU08A, LineId = 64},
+        {ScriptId = scriptIds.YU08B, LineId = 63},
+    },
+    {
+        {ScriptId = scriptIds.YU08A, LineId = 67},
+        {ScriptId = scriptIds.YU08B, LineId = 66},
+    },
+    {
+        {ScriptId = scriptIds.YU08A, StartLineId = 70, EndLineId = 71},
+        {ScriptId = scriptIds.YU08B, StartLineId = 69, EndLineId = 70},
+    },
+    {
+        {ScriptId = scriptIds.YU08A, LineId = 73},
+        {ScriptId = scriptIds.YU08B, LineId = 72},
+    },
+    {
+        {ScriptId = scriptIds.YU08A, LineId = 75},
+        {ScriptId = scriptIds.YU08B, LineId = 74},
+    },
+    {
+        {ScriptId = scriptIds.YU08A, StartLineId = 77, EndLineId = 83},
+        {ScriptId = scriptIds.YU08B, StartLineId = 76, EndLineId = 82},
+    },
+    {
+        {ScriptId = scriptIds.YU09A, StartLineId = 0, EndLineId = 9},
+        {ScriptId = scriptIds.YU09B, StartLineId = 0, EndLineId = 9},
+    },
+    {
+        {ScriptId = scriptIds.YU09A, LineId = 11},
+        {ScriptId = scriptIds.YU09B, LineId = 11},
+    },
+    {
+        {ScriptId = scriptIds.YU09A, LineId = 13},
+        {ScriptId = scriptIds.YU09B, LineId = 13},
+    },
+    {
+        {ScriptId = scriptIds.YU09A, StartLineId = 16, EndLineId = 20},
+        {ScriptId = scriptIds.YU09B, StartLineId = 16, EndLineId = 20},
+    },
+    {
+        {ScriptId = scriptIds.YU09A, LineId = 28},
+        {ScriptId = scriptIds.YU09B, LineId = 30},
+    },
+    {
+        {ScriptId = scriptIds.YU09A, StartLineId = 30, EndLineId = 35},
+        {ScriptId = scriptIds.YU09B, StartLineId = 32, EndLineId = 37},
+    },
+    {
+        {ScriptId = scriptIds.YU09A, LineId = 41},
+        {ScriptId = scriptIds.YU09B, LineId = 43},
+    },
+    {
+        {ScriptId = scriptIds.YU09A, LineId = 43},
+        {ScriptId = scriptIds.YU09B, LineId = 45},
+    },
+    {
+        {ScriptId = scriptIds.YU09A, StartLineId = 45, EndLineId = 46},
+        {ScriptId = scriptIds.YU09B, StartLineId = 47, EndLineId = 48},
+    },
+    {
+        {ScriptId = scriptIds.YU09A, StartLineId = 48, EndLineId = 49},
+        {ScriptId = scriptIds.YU09B, StartLineId = 50, EndLineId = 51},
+    },
+    {
+        {ScriptId = scriptIds.YU09A, StartLineId = 51, EndLineId = 52},
+        {ScriptId = scriptIds.YU09B, StartLineId = 53, EndLineId = 54},
+    },
+    {
+        {ScriptId = scriptIds.YU09A, StartLineId = 54, EndLineId = 58},
+        {ScriptId = scriptIds.YU09B, StartLineId = 56, EndLineId = 60},
+    },
+    {
+        {ScriptId = scriptIds.YU09A, LineId = 61},
+        {ScriptId = scriptIds.YU09B, LineId = 66},
+    },
+};
diff --git a/profiles/chlcc/savedata.lua b/profiles/chlcc/savedata.lua
index 1bfddc036..70f91a995 100644
--- a/profiles/chlcc/savedata.lua
+++ b/profiles/chlcc/savedata.lua
@@ -1,7 +1,7 @@
 root.SaveData = {
     Type = SaveDataType.CHLCC,
     SaveFilePath = root.BasePaths.RootSavesDir .. "/chlcc/jpn/SYSTEM.DAT",
-    ThumbnailFilePath = "games/chlcc/savedata/THUMNAIL.DAT",
+    ThumbnailFilePath = root.BasePaths.RootSavesDir .. "/chlcc/jpn/THUMNAIL.DAT",
 
     ScriptMessageData = { -- Pairs of line count and offset into read flag array
         {0x008f, 0x0000}, {0x00a5, 0x008f}, {0x01fe, 0x0134}, {0x0000, 0x0332}, {0x00d2, 0x0332}, {0x01b4, 0x0404},
@@ -154,5 +154,7 @@ root.SaveData = {
         {{416, 415}},
         {{418, 417}},
         {{419}}
-    }
-};
\ No newline at end of file
+    },
+};
+
+include(root.BasePaths.RootProfilesDir .. "/chlcc/equivalentlines.lua");
diff --git a/src/data/savesystem.cpp b/src/data/savesystem.cpp
index 4909fdd7d..5b619f768 100644
--- a/src/data/savesystem.cpp
+++ b/src/data/savesystem.cpp
@@ -203,17 +203,55 @@ void SetTipStatus(size_t tipId, bool isLocked, bool isUnread, bool isNew) {
          "{:s}: save system not implemented\n", __func__);
 }
 
-void SetLineRead(int scriptId, int lineId) {
-  if (Implementation) return Implementation->SetLineRead(scriptId, lineId);
-  ImpLog(LogLevel::Warning, LogChannel::VMStub,
-         "{:s}: save system not implemented\n", __func__);
+std::optional<size_t> GetLineBitOffset(const size_t scriptId,
+                                       const size_t lineId) {
+  if (ScriptMessageData.size() < scriptId) {
+    ImpLog(LogLevel::Error, LogChannel::General, "Script ID {:d} out of bounds",
+           scriptId);
+    return std::nullopt;
+  }
+
+  const bool isAdded = lineId >= ScriptMessageData[scriptId].LineCount;
+  if (isAdded && !AddedLinesData.has_value()) {
+    ImpLog(LogLevel::Warning, LogChannel::General,
+           "Encountered an added line without AddedLineData being supplied in "
+           "the profile.");
+    return std::nullopt;
+  }
+
+  return isAdded ? AddedLinesData->BitFieldOffset +
+                       AddedLinesData->AddedLinesPerScript * scriptId +
+                       (lineId - ScriptMessageData[scriptId].LineCount)
+                 : ScriptMessageData[scriptId].SaveDataOffset + lineId;
 }
 
-bool IsLineRead(int scriptId, int lineId) {
-  if (Implementation) return Implementation->IsLineRead(scriptId, lineId);
-  ImpLog(LogLevel::Warning, LogChannel::VMStub,
-         "{:s}: save system not implemented, returing false\n", __func__);
-  return false;
+void SetLineRead(const size_t scriptId, const size_t lineId) {
+  if (Implementation == nullptr) {
+    ImpLog(LogLevel::Warning, LogChannel::VMStub,
+           "{:s}: save system not implemented\n", __func__);
+    return;
+  }
+
+  const std::vector<std::pair<size_t, size_t>> equivalentLines =
+      GetEquivalentLines(scriptId, lineId);
+  for (const auto& [curScriptId, curLineId] : equivalentLines) {
+    Implementation->SetLineRead(curScriptId, curLineId);
+  }
+}
+
+bool IsLineRead(const size_t scriptId, const size_t lineId) {
+  if (Implementation == nullptr) {
+    ImpLog(LogLevel::Warning, LogChannel::VMStub,
+           "{:s}: save system not implemented, returning false\n", __func__);
+    return false;
+  }
+
+  const std::vector<std::pair<size_t, size_t>> equivalentLines =
+      GetEquivalentLines(scriptId, lineId);
+  return std::ranges::any_of(
+      equivalentLines, [](std::pair<size_t, size_t> line) {
+        return Implementation->IsLineRead(line.first, line.second);
+      });
 }
 
 void GetReadMessagesCount(int* totalMessageCount, int* readMessageCount) {
diff --git a/src/data/savesystem.h b/src/data/savesystem.h
index 6a89c4618..8506b8943 100644
--- a/src/data/savesystem.h
+++ b/src/data/savesystem.h
@@ -125,8 +125,8 @@ class SaveSystemBase {
   virtual uint32_t GetTipStatus(size_t tipId) const = 0;
   virtual void SetTipStatus(size_t tipId, bool isLocked, bool isUnread,
                             bool isNew) = 0;
-  virtual void SetLineRead(int scriptId, int lineId) = 0;
-  virtual bool IsLineRead(int scriptId, int MessageId) const = 0;
+  virtual void SetLineRead(size_t scriptId, size_t lineId) = 0;
+  virtual bool IsLineRead(size_t scriptId, size_t lineId) const = 0;
   virtual void GetReadMessagesCount(int* totalMessageCount,
                                     int* readMessageCount) const = 0;
   virtual void GetViewedEVsCount(int* totalEVCount,
@@ -201,8 +201,9 @@ uint8_t GetSaveStatus(SaveType type, int id);
 int GetSaveTitle(SaveType type, int id);
 uint32_t GetTipStatus(size_t tipId);
 void SetTipStatus(size_t tipId, bool isLocked, bool isUnread, bool isNew);
-void SetLineRead(int scriptId, int lineId);
-bool IsLineRead(int scriptId, int lineId);
+std::optional<size_t> GetLineBitOffset(size_t scriptId, size_t lineId);
+void SetLineRead(size_t scriptId, size_t lineId);
+bool IsLineRead(size_t scriptId, size_t lineId);
 void GetReadMessagesCount(int* totalMessageCount, int* readMessageCount);
 void GetViewedEVsCount(int* totalEVCount, int* viewedEVCount);
 void GetEVStatus(int evId, int* totalVariations, int* viewedVariations);
diff --git a/src/games/cclcc/savesystem.cpp b/src/games/cclcc/savesystem.cpp
index 504a1f7d5..ffc26a848 100644
--- a/src/games/cclcc/savesystem.cpp
+++ b/src/games/cclcc/savesystem.cpp
@@ -857,25 +857,23 @@ void SaveSystem::SetTipStatus(size_t tipId, bool isLocked, bool isUnread,
   }
 }
 
-void SaveSystem::SetLineRead(int scriptId, int lineId) {
-  if (scriptId >= 255) return;
-
-  uint32_t offset = ScriptMessageData[scriptId].SaveDataOffset + lineId;
-  if (offset == 0xFFFFFFFF) return;
+void SaveSystem::SetLineRead(const size_t scriptId, const size_t lineId) {
+  const std::optional<size_t> offset = GetLineBitOffset(scriptId, lineId);
+  if (!offset.has_value()) return;
 
   // TODO: update some ScrWorks (2003, 2005 & 2006)
 
-  MessageFlags[offset >> 3] |= Flbit[offset & 0b111];
+  MessageFlags[*offset >> 3] |= Flbit[*offset & 0b111];
 }
 
-bool SaveSystem::IsLineRead(int scriptId, int lineId) const {
-  if (scriptId >= 255) return false;
+bool SaveSystem::IsLineRead(const size_t scriptId, const size_t lineId) const {
+  const std::optional<size_t> offset = GetLineBitOffset(scriptId, lineId);
+  if (!offset.has_value()) return false;
 
-  uint32_t offset = ScriptMessageData[scriptId].SaveDataOffset + lineId;
-  uint8_t flbit = Flbit[offset & 0b111];
-  uint8_t viewed = MessageFlags[offset >> 3];
+  const uint8_t flbit = Flbit[*offset & 0b111];
+  const uint8_t viewed = MessageFlags[*offset >> 3];
 
-  return (bool)(flbit & viewed);
+  return static_cast<bool>(flbit & viewed);
 }
 
 void SaveSystem::GetReadMessagesCount(int* totalMessageCount,
@@ -883,12 +881,12 @@ void SaveSystem::GetReadMessagesCount(int* totalMessageCount,
   *totalMessageCount = 0;
   *readMessageCount = 0;
 
-  for (int scriptId = 0; scriptId < StoryScriptCount; scriptId++) {
+  for (size_t scriptId = 0; scriptId < ScriptMessageData.size(); scriptId++) {
     ScriptMessageDataPair script = ScriptMessageData[scriptId];
     *totalMessageCount += script.LineCount;
 
     for (size_t lineId = 0; lineId < script.LineCount; lineId++) {
-      *readMessageCount += IsLineRead(scriptId, (int)lineId);
+      *readMessageCount += IsLineRead(scriptId, lineId);
     }
   }
 }
diff --git a/src/games/cclcc/savesystem.h b/src/games/cclcc/savesystem.h
index 76c5aac2b..3bfeb6eec 100644
--- a/src/games/cclcc/savesystem.h
+++ b/src/games/cclcc/savesystem.h
@@ -67,8 +67,8 @@ class SaveSystem : public SaveSystemBase {
   void SetTipStatus(size_t tipId, bool isLocked, bool isUnread,
                     bool isNew) override;
 
-  void SetLineRead(int scriptId, int lineId) override;
-  bool IsLineRead(int scriptId, int lineId) const override;
+  void SetLineRead(size_t scriptId, size_t lineId) override;
+  bool IsLineRead(size_t scriptId, size_t lineId) const override;
   void GetReadMessagesCount(int* totalMessageCount,
                             int* readMessageCount) const override;
 
diff --git a/src/games/chlcc/savesystem.cpp b/src/games/chlcc/savesystem.cpp
index a7ffce915..926273320 100644
--- a/src/games/chlcc/savesystem.cpp
+++ b/src/games/chlcc/savesystem.cpp
@@ -1064,25 +1064,23 @@ void SaveSystem::SetTipStatus(size_t tipId, bool isLocked, bool isUnread,
   }
 }
 
-void SaveSystem::SetLineRead(int scriptId, int lineId) {
-  if (std::ssize(ScriptMessageData) <= scriptId) return;
-
-  uint32_t offset = ScriptMessageData[scriptId].SaveDataOffset + lineId;
-  if (offset == 0xFFFFFFFF) return;
+void SaveSystem::SetLineRead(const size_t scriptId, const size_t lineId) {
+  const std::optional<size_t> offset = GetLineBitOffset(scriptId, lineId);
+  if (!offset.has_value()) return;
 
   // TODO: update some ScrWorks (2003, 2005 & 2006)
 
-  MessageFlags[offset >> 3] |= Flbit[offset & 0b111];
+  MessageFlags[*offset >> 3] |= Flbit[*offset & 0b111];
 }
 
-bool SaveSystem::IsLineRead(int scriptId, int lineId) const {
-  if (std::ssize(ScriptMessageData) <= scriptId) return false;
+bool SaveSystem::IsLineRead(const size_t scriptId, const size_t lineId) const {
+  const std::optional<size_t> offset = GetLineBitOffset(scriptId, lineId);
+  if (!offset.has_value()) return false;
 
-  uint32_t offset = ScriptMessageData[scriptId].SaveDataOffset + lineId;
-  uint8_t flbit = Flbit[offset & 0b111];
-  uint8_t viewed = MessageFlags[offset >> 3];
+  const uint8_t flbit = Flbit[*offset & 0b111];
+  const uint8_t viewed = MessageFlags[*offset >> 3];
 
-  return (bool)(flbit & viewed);
+  return static_cast<bool>(flbit & viewed);
 }
 
 void SaveSystem::GetReadMessagesCount(int* totalMessageCount,
@@ -1090,12 +1088,12 @@ void SaveSystem::GetReadMessagesCount(int* totalMessageCount,
   *totalMessageCount = 0;
   *readMessageCount = 0;
 
-  for (int scriptId = 0; scriptId < StoryScriptCount; scriptId++) {
+  for (size_t scriptId = 0; scriptId < ScriptMessageData.size(); scriptId++) {
     ScriptMessageDataPair script = ScriptMessageData[scriptId];
     *totalMessageCount += script.LineCount;
 
     for (size_t lineId = 0; lineId < script.LineCount; lineId++) {
-      *readMessageCount += IsLineRead(scriptId, (int)lineId);
+      *readMessageCount += IsLineRead(scriptId, lineId);
     }
   }
 }
diff --git a/src/games/chlcc/savesystem.h b/src/games/chlcc/savesystem.h
index 36f246847..49f832f2c 100644
--- a/src/games/chlcc/savesystem.h
+++ b/src/games/chlcc/savesystem.h
@@ -64,8 +64,8 @@ class SaveSystem : public SaveSystemBase {
   void SetTipStatus(size_t tipId, bool isLocked, bool isUnread,
                     bool isNew) override;
 
-  void SetLineRead(int scriptId, int lineId) override;
-  bool IsLineRead(int scriptId, int lineId) const override;
+  void SetLineRead(size_t scriptId, size_t lineId) override;
+  bool IsLineRead(size_t scriptId, size_t lineId) const override;
   void GetReadMessagesCount(int* totalMessageCount,
                             int* readMessageCount) const override;
 
diff --git a/src/games/mo6tw/savesystem.cpp b/src/games/mo6tw/savesystem.cpp
index 8aaa02201..ae6bf95b6 100644
--- a/src/games/mo6tw/savesystem.cpp
+++ b/src/games/mo6tw/savesystem.cpp
@@ -545,27 +545,23 @@ void SaveSystem::SetTipStatus(size_t tipId, bool isLocked, bool isUnread,
   }
 }
 
-void SaveSystem::SetLineRead(int scriptId, int lineId) {
-  if (scriptId >= StoryScriptCount.value()) return;
-
-  uint32_t offset =
-      ScriptMessageData[StoryScriptIDs[scriptId]].SaveDataOffset + lineId;
-  if (offset == 0xFFFFFFFF) return;
+void SaveSystem::SetLineRead(const size_t scriptId, const size_t lineId) {
+  const std::optional<size_t> offset = GetLineBitOffset(scriptId, lineId);
+  if (!offset.has_value()) return;
 
   // TODO: update some ScrWorks (2003, 2005 & 2006)
 
-  MessageFlags[offset >> 3] |= Flbit[offset & 0b111];
+  MessageFlags[*offset >> 3] |= Flbit[*offset & 0b111];
 }
 
-bool SaveSystem::IsLineRead(int scriptId, int lineId) const {
-  if (scriptId >= StoryScriptCount.value()) return false;
+bool SaveSystem::IsLineRead(const size_t scriptId, const size_t lineId) const {
+  const std::optional<size_t> offset = GetLineBitOffset(scriptId, lineId);
+  if (!offset.has_value()) return false;
 
-  uint32_t offset =
-      ScriptMessageData[StoryScriptIDs[scriptId]].SaveDataOffset + lineId;
-  uint8_t flbit = Flbit[offset & 0b111];
-  uint8_t viewed = MessageFlags[offset >> 3];
+  const uint8_t flbit = Flbit[*offset & 0b111];
+  const uint8_t viewed = MessageFlags[*offset >> 3];
 
-  return (bool)(flbit & viewed);
+  return static_cast<bool>(flbit & viewed);
 }
 
 void SaveSystem::GetReadMessagesCount(int* totalMessageCount,
@@ -573,12 +569,12 @@ void SaveSystem::GetReadMessagesCount(int* totalMessageCount,
   *totalMessageCount = 0;
   *readMessageCount = 0;
 
-  for (int scriptId = 0; scriptId < StoryScriptCount; scriptId++) {
+  for (size_t scriptId = 0; scriptId < StoryScriptIDs.size(); scriptId++) {
     ScriptMessageDataPair script = ScriptMessageData[StoryScriptIDs[scriptId]];
     *totalMessageCount += script.LineCount;
 
     for (size_t lineId = 0; lineId < script.LineCount; lineId++) {
-      *readMessageCount += IsLineRead(scriptId, (int)lineId);
+      *readMessageCount += IsLineRead(scriptId, lineId);
     }
   }
 }
diff --git a/src/games/mo6tw/savesystem.h b/src/games/mo6tw/savesystem.h
index 8553b3a8c..dc43bfca0 100644
--- a/src/games/mo6tw/savesystem.h
+++ b/src/games/mo6tw/savesystem.h
@@ -38,8 +38,8 @@ class SaveSystem : public SaveSystemBase {
   uint32_t GetTipStatus(size_t tipId) const override;
   void SetTipStatus(size_t tipId, bool isLocked, bool isUnread,
                     bool isNew) override;
-  void SetLineRead(int scriptId, int lineId) override;
-  bool IsLineRead(int scriptId, int lineId) const override;
+  void SetLineRead(size_t scriptId, size_t lineId) override;
+  bool IsLineRead(size_t scriptId, size_t lineId) const override;
   void GetReadMessagesCount(int* totalMessageCount,
                             int* readMessageCount) const override;
   void GetViewedEVsCount(int* totalEVCount, int* viewedEVCount) const override;
diff --git a/src/profile/data/savesystem.cpp b/src/profile/data/savesystem.cpp
index e8d89e5f9..37c443223 100644
--- a/src/profile/data/savesystem.cpp
+++ b/src/profile/data/savesystem.cpp
@@ -9,10 +9,100 @@
 
 namespace Impacto {
 namespace Profile {
+
+template <>
+struct TryGetImpl<SaveSystem::AddedLinesDataStruct> {
+  static std::optional<SaveSystem::AddedLinesDataStruct> Call() {
+    if (!lua_istable(LuaState, -1)) return std::nullopt;
+
+    const std::optional<size_t> bitFieldOffset =
+        TryGetMember<size_t>("BitFieldOffset");
+    if (!bitFieldOffset.has_value()) {
+      ImpLog(LogLevel::Fatal, LogChannel::Profile, "Missing BitFieldOffset");
+      return std::nullopt;
+    }
+
+    const std::optional<size_t> addedLinesPerScript =
+        TryGetMember<size_t>("AddedLinesPerScript");
+    if (!addedLinesPerScript.has_value()) {
+      ImpLog(LogLevel::Fatal, LogChannel::Profile,
+             "Missing AddedLinesPerScript");
+      return std::nullopt;
+    }
+
+    return SaveSystem::AddedLinesDataStruct{
+        .BitFieldOffset = *bitFieldOffset,
+        .AddedLinesPerScript = *addedLinesPerScript,
+    };
+  }
+};
+
 namespace SaveSystem {
+struct LineRange {
+  size_t ScriptId;
+  size_t StartLineId;
+  size_t EndLineId;
+
+  size_t EquivalentLineRangesIdx = 0;
+
+  bool Intersects(const LineRange& other) const {
+    return ScriptId == other.ScriptId &&
+           !(other.EndLineId < StartLineId || EndLineId < other.StartLineId);
+  }
+};
+}  // namespace SaveSystem
+
+template <>
+struct TryGetImpl<SaveSystem::LineRange> {
+  static std::optional<SaveSystem::LineRange> Call() {
+    if (!lua_istable(LuaState, -1)) return std::nullopt;
+
+    const std::optional<size_t> scriptId = TryGetMember<size_t>("ScriptId");
+    if (!scriptId.has_value()) {
+      ImpLog(LogLevel::Fatal, LogChannel::Profile,
+             "Missing ScriptId in equivalent line range");
+      return std::nullopt;
+    }
 
+    std::optional<size_t> startLineId = TryGetMember<size_t>("StartLineId");
+    std::optional<size_t> endLineId;
+    if (!startLineId.has_value()) {
+      startLineId = TryGetMember<size_t>("LineId");
+
+      if (!startLineId.has_value()) {
+        ImpLog(LogLevel::Fatal, LogChannel::Profile,
+               "Missing LineId in equivalent line range");
+        return std::nullopt;
+      }
+
+      endLineId = startLineId;
+    } else {
+      endLineId = TryGetMember<size_t>("EndLineId");
+
+      if (!endLineId.has_value()) {
+        ImpLog(LogLevel::Fatal, LogChannel::Profile,
+               "Missing EndLineId in equivalent line range");
+        return std::nullopt;
+      }
+    }
+
+    return SaveSystem::LineRange{
+        .ScriptId = *scriptId,
+        .StartLineId = *startLineId,
+        .EndLineId = *endLineId,
+    };
+  }
+};
+
+namespace SaveSystem {
 using namespace Impacto::SaveSystem;
 
+// EquivalentRanges holds all equivalent classes between ranges.
+// ScriptRanges allows one to fetch all equivalent classes pertaining to an
+// individual script ID, for faster lookups.
+static std::vector<std::vector<LineRange>> EquivalentLineRanges;
+static std::map<size_t, std::vector<LineRange>> ScriptLineRanges;
+
 void Configure() {
   EnsurePushMemberOfType("SaveData", LUA_TTABLE);
 
@@ -39,20 +129,7 @@ void Configure() {
 
   SaveFilePath = EnsureGetMember<std::string>("SaveFilePath");
 
-  if (TryPushMember("StoryScriptIDs")) {
-    AssertIs(LUA_TTABLE);
-
-    StoryScriptCount = (int)lua_rawlen(LuaState, -1);
-    StoryScriptIDs.resize(*StoryScriptCount);
-    PushInitialIndex();
-    while (PushNextTableElement() != 0) {
-      int i = EnsureGetKey<int32_t>() - 1;
-      StoryScriptIDs[i] = EnsureGetArrayElement<int>();
-      Pop();
-    }
-
-    Pop();
-  }
+  TryGetMember<std::vector<uint32_t>>("StoryScriptIDs", StoryScriptIDs);
 
   if (TryPushMember("ScriptMessageData")) {
     AssertIs(LUA_TTABLE);
@@ -136,9 +213,95 @@ void Configure() {
     Pop();
   }
 
+  AddedLinesData = TryGetMember<AddedLinesDataStruct>("AddedLinesData");
+
+  if (TryPushMember("EquivalentLines")) {
+    ForEachProfileArray([](const uint32_t index) {
+      std::vector<LineRange>& equivalentRangeList =
+          EquivalentLineRanges.emplace_back(
+              EnsureGet<std::vector<LineRange>>());
+      if (equivalentRangeList.size() < 2) {
+        ImpLog(LogLevel::Warning, LogChannel::Profile,
+               "Equivalent range list of size < 2 loaded from the profile");
+        EquivalentLineRanges.pop_back();
+        return;
+      }
+
+      const size_t rangeLength = equivalentRangeList.front().EndLineId -
+                                 equivalentRangeList.front().StartLineId;
+      for (auto curIt = equivalentRangeList.begin();
+           curIt != equivalentRangeList.end(); curIt++) {
+        if (curIt->EndLineId < curIt->StartLineId) {
+          throw std::runtime_error(fmt::format(
+              "EndLineId < StartLineId for equivalent line range [{:d}, "
+              "{:d}] of script {:d}",
+              curIt->StartLineId, curIt->EndLineId, curIt->ScriptId));
+        }
+
+        if (curIt->EndLineId - curIt->StartLineId != rangeLength) {
+          throw std::runtime_error(fmt::format(
+              "Expected range length {:d} for equivalent line range [{:d}, "
+              "{:d}] of script {:d}",
+              rangeLength, curIt->StartLineId, curIt->EndLineId,
+              curIt->ScriptId));
+        }
+
+        // Ranges may not intersect because a single binary search pass is used
+        // to identify the equivalent lines
+        std::vector<LineRange>& scriptVector =
+            ScriptLineRanges.try_emplace(curIt->ScriptId).first->second;
+        if (const auto intersected =
+                std::ranges::find_if(scriptVector,
+                                     [curIt](const auto& other) {
+                                       return curIt->Intersects(other);
+                                     });
+            intersected != scriptVector.end()) {
+          throw std::runtime_error(fmt::format(
+              "Line range [{:d}, {:d}] of script {:d} intersects with line "
+              "range [{:d}, {:d}]",
+              curIt->StartLineId, curIt->EndLineId, curIt->ScriptId,
+              intersected->StartLineId, intersected->EndLineId));
+        }
+
+        curIt->EquivalentLineRangesIdx = EquivalentLineRanges.size() - 1;
+        scriptVector.emplace_back(*curIt);
+      }
+    });
+
+    // Sort the ranges in ScriptLineRanges to be able to binary search
+    for (auto& [scriptId, lineRanges] : ScriptLineRanges) {
+      std::ranges::sort(lineRanges, std::less<size_t>(), &LineRange::EndLineId);
+    }
+
+    Pop();
+  }
+
   Pop();
 }
 
+std::vector<std::pair<size_t, size_t>> GetEquivalentLines(const size_t scriptId,
+                                                          const size_t lineId) {
+  const auto scriptLineRangesIt = ScriptLineRanges.find(scriptId);
+  if (scriptLineRangesIt == ScriptLineRanges.end()) return {{scriptId, lineId}};
+
+  const std::vector<LineRange>& scriptLineRanges = scriptLineRangesIt->second;
+  const auto lineRange = std::ranges::lower_bound(
+      scriptLineRanges, lineId, std::less<size_t>(), &LineRange::EndLineId);
+  if (lineRange == scriptLineRanges.end() || lineId < lineRange->StartLineId) {
+    return {{scriptId, lineId}};
+  }
+
+  const size_t offset = lineId - lineRange->StartLineId;
+  std::vector<std::pair<size_t, size_t>> equivalentLines;
+  std::ranges::transform(
+      EquivalentLineRanges[lineRange->EquivalentLineRangesIdx],
+      std::back_inserter(equivalentLines), [offset](const auto& range) {
+        return std::pair{range.ScriptId, range.StartLineId + offset};
+      });
+
+  return equivalentLines;
+}
+
 }  // namespace SaveSystem
 }  // namespace Profile
 }  // namespace Impacto
\ No newline at end of file
diff --git a/src/profile/data/savesystem.h b/src/profile/data/savesystem.h
index adaaa3a87..e67b1ddc0 100644
--- a/src/profile/data/savesystem.h
+++ b/src/profile/data/savesystem.h
@@ -18,12 +18,20 @@ inline Impacto::SaveSystem::SaveDataType Type =
 inline std::string SaveFilePath;
 inline std::optional<std::string> ThumbnailFilePath;
 inline std::vector<uint32_t> StoryScriptIDs;
-inline std::optional<int> StoryScriptCount;
 inline std::vector<Impacto::SaveSystem::ScriptMessageDataPair>
     ScriptMessageData;
 inline uint16_t AlbumEvData[MaxAlbumEntries][MaxAlbumSubEntries];
 inline uint16_t AlbumData[MaxAlbumEntries][MaxAlbumSubEntries][MaxCGSprites];
 
+struct AddedLinesDataStruct {
+  size_t BitFieldOffset;
+  size_t AddedLinesPerScript;
+};
+inline std::optional<AddedLinesDataStruct> AddedLinesData;
+
+std::vector<std::pair<size_t, size_t>> GetEquivalentLines(size_t scriptId,
+                                                          size_t lineId);
+
 void Configure();
 
 }  // namespace SaveSystem
diff --git a/src/vm/inst_dialogue.cpp b/src/vm/inst_dialogue.cpp
index e20c2941b..5d9848772 100644
--- a/src/vm/inst_dialogue.cpp
+++ b/src/vm/inst_dialogue.cpp
@@ -33,13 +33,15 @@ VmInstruction(InstMesViewFlag) {
     case 0: {  // Set
       PopExpression(scriptId);
       PopExpression(lineId);
-      SaveSystem::SetLineRead(scriptId, lineId);
+      SaveSystem::SetLineRead(static_cast<size_t>(scriptId),
+                              static_cast<size_t>(lineId));
     } break;
     case 1: {  // Check
       PopExpression(scrWorkEntry);
       PopExpression(scriptId);
       PopExpression(lineId);
-      ScrWork[scrWorkEntry] = SaveSystem::IsLineRead(scriptId, lineId);
+      ScrWork[scrWorkEntry] = SaveSystem::IsLineRead(
+          static_cast<size_t>(scriptId), static_cast<size_t>(lineId));
     } break;
   }
 }
@@ -137,8 +139,9 @@ static bool InstMesSyncMain(int pageId, SyncType type) {
               currentPage.PushBacklogEntry();
             }
 
-            SaveSystem::SetLineRead(ScrWork[currentPage.Id * 2 + SW_SCRIPTID],
-                                    ScrWork[currentPage.Id * 2 + SW_LINEID]);
+            SaveSystem::SetLineRead(
+                static_cast<size_t>(ScrWork[currentPage.Id * 2 + SW_SCRIPTID]),
+                static_cast<size_t>(ScrWork[currentPage.Id * 2 + SW_LINEID]));
 
             return false;
           }
@@ -154,8 +157,9 @@ static bool InstMesSyncMain(int pageId, SyncType type) {
       case Hidden:
         currentPage.PushBacklogEntry();
         SetFlag(SF_MESCLEAR0 + currentPage.Id, true);
-        SaveSystem::SetLineRead(ScrWork[currentPage.Id * 2 + SW_SCRIPTID],
-                                ScrWork[currentPage.Id * 2 + SW_LINEID]);
+        SaveSystem::SetLineRead(
+            static_cast<size_t>(ScrWork[currentPage.Id * 2 + SW_SCRIPTID]),
+            static_cast<size_t>(ScrWork[currentPage.Id * 2 + SW_LINEID]));
         return false;
       default:
         break;
@@ -482,8 +486,9 @@ VmInstruction(InstMesCls) {
       SetFlag(SF_SHOWWAITICON + pageId, false);
       SetFlag(SF_MESCLEAR0 + pageId, true);
 
-      SaveSystem::SetLineRead(ScrWork[SW_SCRIPTID + pageId * 2],
-                              ScrWork[SW_LINEID + pageId * 2]);
+      SaveSystem::SetLineRead(
+          static_cast<size_t>(ScrWork[SW_SCRIPTID + pageId * 2]),
+          static_cast<size_t>(ScrWork[SW_LINEID + pageId * 2]));
 
       if (!GetFlag(SF_REVADDDISABLE)) {
         page.PushBacklogEntry();
@@ -614,8 +619,9 @@ VmInstruction(InstMesMain) {
 
     SetFlag(SF_MESCLEAR0 + currentPage.Id, true);
 
-    SaveSystem::SetLineRead(ScrWork[currentPage.Id * 2 + SW_SCRIPTID],
-                            ScrWork[currentPage.Id * 2 + SW_LINEID]);
+    SaveSystem::SetLineRead(
+        static_cast<size_t>(ScrWork[currentPage.Id * 2 + SW_SCRIPTID]),
+        static_cast<size_t>(ScrWork[currentPage.Id * 2 + SW_LINEID]));
     return;
   }
 
@@ -668,8 +674,9 @@ VmInstruction(InstMesMain) {
         SetFlag(SF_MESCLEAR0 + currentPage.Id, true);
       }
 
-      SaveSystem::SetLineRead(ScrWork[currentPage.Id * 2 + SW_SCRIPTID],
-                              ScrWork[currentPage.Id * 2 + SW_LINEID]);
+      SaveSystem::SetLineRead(
+          static_cast<size_t>(ScrWork[currentPage.Id * 2 + SW_SCRIPTID]),
+          static_cast<size_t>(ScrWork[currentPage.Id * 2 + SW_LINEID]));
 
       currentPage.PushBacklogEntry();