fcfec7bc_Dana_Jacobsen__blogs_perl_org__Combinations_and_Permutations_Derange
[Module] Algorithm::Permute [Impl] XS [Comb] no [Perm] yes [Comb w/rep] no [Perm w/rep] no [Speed] + [Order] Impl [Comments] Iterator or fast block call [Derange] 
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Dana Jacobsen [blogs.perl.org]