/usr/lib/s9fes/help/vector-ref is in scheme9 2010.11.13-2.
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1 2 3 4 5 6 | R4RS 6.8 (vector-ref vector integer) ==> object
INTEGER must be a valid index of VECTOR. VECTOR-REF returns the
contents of the element at the INTEGER'th position of VECTOR.
(vector-ref '#(1 1 2 3 5 8 13 21) 5) ==> 8
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