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--- a/alphabet.cpp 2023-04-14 21:35:23.646820868 +0530 +++ b/alphabet.cpp 2023-04-14 22:09:01.836357064 +0530 @@ -400,7 +400,7 @@ const char *iupacs = "!ACMGRSVTWYHKDBN!acmgrsvtwyhkdbn"; -char mask2iupac[16] = { +signed char mask2iupac[16] = { -1, 'A', // 0001 'C', // 0010