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One-liner variation shortened solution in Creative category for Non-unique Elements by suic
# Shortened. Thanks Carvalho! https://py.checkio.org/mission/non-unique-elements/publications/suic/python-3/one-liner-variation/share/5d1ea85df7c393c426b55d38ec7ac32d/#comment-57487
checkio=lambda d:[i for i in d if d.count(i)-1]
Nov. 27, 2017
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