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AnnaCho's One-liner solution in Creative category for The End of Other by suic
# Based on: http://www.checkio.org/mission/end-of-other/publications/AnnaCho/python-3/first/
# Thanks :)
checkio = lambda ws: any(i != j and (i == i.replace(j,"",1) + j) for j in ws for i in ws)
March 17, 2015