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S9 LIB  (subvector vector integer1 integer2)  ==>  vector
        (vector-copy vector)                  ==>  vector

SUBVECTOR returns a fresh vector formed from the members of VECTOR
beginning with index INTEGER1 (inclusive) and ending with index
INTEGER2 (exclusive).

(Vector-copy v) is shorthand for (subvector v 0 (vector-length v)).

(subvector '#(a b c d e) 2 4)  ==>  #(c d)
(subvector '#(a b c d e) 2 2)  ==>  #()
(vector-copy '#(a b c))        ==>  #(a b c)