ISBN2 by flagitious

#!ruby -p
$_[n= ~/\?/]=?0
$_[n]+=1while(eval'+$_[_+=1]%?U*(2+?Z*_-_%2*?B)'*~_=-~/$/)%(~/$/^5)>0

Note that non-ascii characters in the above source code will be escaped (such as \x9f).

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