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-- v2.13 CORPUS-IV: string.sub index matrix (negative, clamp, -- inverted, zero). local s = "abcdef" print(s:sub(2), s:sub(2, 4), s:sub(-3)) print(s:sub(-3, -2), s:sub(1, -1), s:sub(0)) print(s:sub(4, 2) == "", s:sub(10) == "", s:sub(-10, 2)) print(s:sub(0, 0) == "", s:sub(-100, 100))