Sierpinski Fractal by %20(mitchs (%20 (shinh)))

:
s/^\w*/&&/
y/54321/4321 /
s!__\|\\/!  !g
s! /\|\\ \?\| $!/\\!gp
s! /. \?!/__\\!gp
/^\//Q
b

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

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