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srid/gist:1225913

Created September 19, 2011 03:21
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;; amalloy's solution to http://4clojure.com/problem/60
(fn r
([f [x & coll]] (r f x coll))
([f acc coll]
(lazy-seq
(if-let [[x & coll] (seq coll)]
(cons acc
(r f (f acc x) coll))
[acc]))))
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