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NewAlexandria/letter permutation

Created April 9, 2015 13:30
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Outputs string combinatorics
Raw
letter permutation
r = ('a'..'z')
r.map{|l| r.map{|w| r.map{|q| q+w+l} } }.flatten
r.map{|l| r.map{|w| r.map{|q| r.map{|t| q+w+l+t } }} }.flatten.size
# add exclusions
# add recursion
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