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R4RS 6.3 (append list ...) ==> list
(append list ... object) ==> object
Returns a list consisting of the elements of the first list followed
by the elements of the other lists.
(append '(x) '(y)) ==> (x y)
(append '(a) '(b c d)) ==> (a b c d)
(append '(a (b)) '((c))) ==> (a (b) (c))
The resulting list is always newly allocated, except that it shares
structure with the last list argument. The last argument may actually
be any object; an improper list results if the last argument is not
a proper list.
(append '(a b) '(c . d)) ==> (a b c . d)
(append '() 'a) ==> a
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