/usr/lib/s9fes/help/substring is in scheme9 2010.11.13-2.
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1 2 3 4 5 6 7 8 9 | R4RS 6.7 (substring string INTEGER-0 INTEGER-N) ==> string
STRING must be a string, and INTEGER-0 and INTEGER-N must satisfy
0 <= INTEGER-0 <= INTEGER-N <= (string-length string).
SUBSTRING returns a newly allocated string formed from the characters
of STRING beginning with index INTEGER-0 (inclusive) and ending with
index INTEGER-N (exclusive).
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