Squares All The Way Down by tails

:
s/  #/###/g
s/ \{7\}/&  /g
s/\(.*\n\)\1*/\1\1&/mg
s/$/ x#\n x#\nx\n/
s/x/        #/g
/^#/M!b

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

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