/usr/lib/help/subvector is in scheme9 2013.11.26-1.
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1 2 3 4 5 6 7 8 | S9 LIB (subvector vector integer1 integer2) ==> vector
SUBVECTOR returns a fresh vector formed from the members of VECTOR
beginning with index INTEGER1 (inclusive) and ending with index
INTEGER2 (exclusive).
(subvector '#(a b c d e) 2 4) ==> #(c d)
(subvector '#(a b c d e) 2 2) ==> #()
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