Sierpinski Fractal by %20(shinh)

s/^/ /
:1
y!54321!4321/!
s/ */&&/
/\w/b1
:
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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