Sierpinski Carpet by 51b

l;main(n,m){for(n=m="\x03\x09\x1b"[-m%3];!l?l=n,m--:printf(--l?m/9*4+m/3+m&l/9*4+l/3+l&21?"  ":"::":"::\n"););}

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

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