for$@(r,u,0,d){$_.=$"x!!$@x9^$@x s/$@/ /ig,s/./$b[$\++].=$&/ge,$\=$/for(@a,@b)=reverse<>,@b}/.*\S/&&print$&for@b
Note that non-ascii characters in the above source code will be escaped (such as \x9f).
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