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RosettaCodeData/Task/Permutations-Derangements/J/permutations-derangements-1.j
Ingy döt Net f23f22d71c Initial data commit
2023-07-01 13:44:08 -04:00

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