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oneline solution in Creative category for Common Words by somnambulism
checkio = lambda a, b: ','.join([x for x in sorted(a.split(',')) if x in b.split(',')])
#These "asserts" using only for self-checking and not necessary for auto-testing
if __name__ == '__main__':
assert checkio("hello,world", "hello,earth") == "hello", "Hello"
assert checkio("one,two,three", "four,five,six") == "", "Too different"
assert checkio("one,two,three", "four,five,one,two,six,three") == "one,three,two", "1 2 3"
July 18, 2014
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