Sierpinski Carpet by nn

for(i=n=new Date%4*9||3;i--;print(o))for(o=j='';j<2*n;)o+=': : '[i/9&j/18|i/3%3&j/6%3|i%3&j++/2%3]

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

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