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amalloy/gist:5500495

Created May 2, 2013 06:32
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gistfile1.clj
(fn remove-once [pred coll]
(lazy-seq
(when-let [coll (seq coll)]
(let [x (first coll), xs (rest coll)]
(if (pred x)
xs
(cons x (remove-once pred xs)))))))
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