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podhmo/gist:534527

Created August 18, 2010 12:25
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gistfile1.clj
(defn overlap [coll]
(->> coll
(reduce (fn [m x]
(assoc m x (+ 1 (get m x 0))))
{})
(filter (fn [[_ i]] (> i 1)))
(map first)))
(map (fn [x] x) (overlap [3 1 4 1 5 9 2 6 5 3 5 8 9]))
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