put "pple" into x
answer char 2 to char 5 of x  // n = 2, m=5
answer char 2 to len(x) of x  // n = 2, m = len(x), can also use -1
answer char 1 to -2 of x  // n = 1, m = 1 less than length of string
answer char offset("p",x) to -1 of x // known char "p" to end of string
answer char offset("pl",x) to -1 of x // known "pl" to end of string