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Short is funnier than long solution in Creative category for CheckSum by veky
checkio=lambda d:(lambda s:(str(-s%10),s))(sum((lambda v:(sum(map(int,str(v*2))),
v)[i&1])(ord(c)-48)for i,c in enumerate(filter(str.isalnum,d[::~0]))))
March 4, 2015
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