/usr/lib/s9fes/help/pairp is in scheme9 2010.11.13-2.
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1 2 3 4 5 6 7 8 | R4RS 6.3 (pair? object) ==> boolean
PAIR? returns #T if OBJECT is a pair, and otherwise returns #F.
(pair? '(a . b)) ==> #t
(pair? '(a b c)) ==> #t
(pair? '()) ==> #f
(pair? '#(a b)) ==> #f
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