/usr/lib/help/leap-yearp is in scheme9 2013.11.26-1.
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1 2 3 4 5 6 | S9 LIB (leap-year? integer) ==> boolean
Return #T if INTEGER represents a leap year and otherwise return #F.
(leap-year? 2000) ==> #t
(leap-year? 2003) ==> #f
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