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/usr/lib/help/vector-append is in scheme9 2013.11.26-1.

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S9 LIB  (vector-append vector ...)  ==>  vector

Returns a fresh vector consisting of the elements of the first vector
followed by the elements of the other vectors in the given order.

(vector-append '#(x) '#(y))        ==>  #(x y)
(vector-append '#(a) '#(b c d))    ==>  #(a b c d)
(vector-append '#(a (b)) '#((c)))  ==>  #(a (b) (c))