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string.subSYNOPSIS
string.sub(s,i[,j])
DESCRIPTION
Returns the substring of s that starts at i and continues until j;
i and j can be negative. If j is absent, then it is assumed to be equal to -1
(which is the same as the string length). In particular, the call string.sub(s,1,j) returns a
prefix of s with length j, and string.sub(s, -i) returns a suffix of
s with length i.
RETURN VALUE
Returns a string.