September 2017 Update
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14570 changed files with 153136 additions and 63871 deletions
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(defn combinations [coll k]
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(when-let [[x & xs] coll]
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(if (= k 1)
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(map list coll)
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(concat (map (partial cons x) (combinations coll (dec k)))
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(combinations xs k)))))
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user> (combinations '[iced jam plain] 2)
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((iced iced) (iced jam) (iced plain) (jam jam) (jam plain) (plain plain))
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