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/usr/lib/s9fes/help/adjoin is in scheme9 2010.11.13-2.

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S9 LIB  (adjoin object list)  ==>  list

Add an element to a set.

(adjoin 'x '(a b c))  ==>  '(x a b c)
(adjoin 'c '(a b c))  ==>  '(a b c)