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RosettaCodeData/Task/Permutations-Derangements/J/permutations-derangements-1.j
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2013-04-10 23:57:08 -07:00

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derangement=: (A.&i.~ !)~ (*/ .~: # [) i. NB. task item 1
subfactorial=: ! * +/@(_1&^ % !)@i.@>: NB. task item 3
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