Squares Fixed by hallvabo

import os
s=t=_=' '*68
i=0
exec"c=os.read(0,1)\nif _<c:s=s[:i+1]+'_'+s[i+2:];t=t[:i]+'|_|'+t[i+3:]\ni+=2\nif' '>c:print s.rstrip();i=0;s,t=t,_\n"*414

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

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return top