y=$<.r.toi\x0d n=[*1..y].j\x0d o=y.ti.m{|x|v=n[0,y-x].lj y,' '+n\x0d v+v[0..-2].rv}\x0d s o+o[0..-2].rv
Note that non-ascii characters in the above source code will be escaped (such as \x9f).
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