/usr/lib/s9fes/help/not is in scheme9 2010.11.13-2.
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1 2 3 4 5 6 7 8 9 10 11 | R4RS 6.1 (not object) ==> boolean
NOT returns #T if OBJECT is false, and returns #F otherwise.
(not #t) ==> #f
(not 3) ==> #f
(not (list 3)) ==> #f
(not #f) ==> #t
(not '()) ==> #f
(not (list)) ==> #f
(not 'nil) ==> #f
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