main(x,y,l,j){for(y=-21;++y<21;puts(""))for(x=-21;l=++x<21;printf((x+j)%(l*=2)&&(y+j)%l?" ":"[]"))for(;j=l*~l,x/j|y/j;)++l;}
Note that non-ascii characters in the above source code will be escaped (such as \x9f).
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