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(defn flat?
"Returns true if seq contains no sequences"
(not-any? (fn [x] (isa? (type x) java.util.List)) seq))
(defn flatten
"Returns an unnested sequence from the non-sequence elements of seq
for example, it turns (1 (2) 3) into (1 2 3)"
(if (isa? (type seq) java.util.List)
(if (flat? seq)
(apply concat (map flatten seq)))
(list seq)))
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