Sierpinski Carpet by GeoJ

s/$/aa/
:
s/.[ a]*/&\U&\E&/g
s/[ aA]./\L&\E&\L&/g
y/A123/ \n12/
/\n/!b
s/.//
y/a/:/

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

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