/usr/lib/s9fes/help/leap-yearp is in scheme9 2010.11.13-2.
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1 2 3 4 5 6 7 8 | S9 LIB (leap-year? integer) ==> boolean
(load-from-library "leap-yearp.scm")
Return #T if INTEGER represents a leap year and otherwise return #F.
(leap-year? 2000) ==> #t
(leap-year? 2003) ==> #f
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