c$ = "abcdefghijklmnopqrstuvwxyz"
n = 12
m = 5
# starting from n characters in and of m length;
print mid(c$, n, m)
# starting from n characters in, up to the end of the string;
print mid(c$, n, length(c$))
# whole string minus last character;
print left(c$, length(c$) - 1)
# starting from a known character within the string and of m length;
print mid(c$, instr(c$, "b"), m)
# starting from a known substring within the string and of m length.
f$ = "pq"
print mid(c$, instr(c$, f$), m)
end