delete words by moriA

import List
d f=f.f
main=getLine>>=interact.d.((unlines.transpose.lines).).(#)
a#(c:x)|take 4x\\a>""=c:a#x|x>""=c:[' '|n<-a]++a#(x\\a)|1>0=x

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

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