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amalloy/gist:8367369

Forked from kpmaynard/gist:8367053
Last active January 2, 2016 21:59
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gistfile1.clj
(defn permx [coll]
(letfn [(helper [m]
(if (empty? m)
'(())
(for [[i x] m
perm (helper (dissoc m i))]
(cons x perm))))]
(helper (into (sorted-map)
(map-indexed vector coll)))))
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