Sierpinski Carpet by %20

s/^/aa/
:
h
s/.*/&&&/mg
x
s/.*/&\U&\E&/mg
G
x
G
y/123/012/
/0/!b
y/aA/: /
s/0//g

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

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