main(a,b,x,y,w){for(b=0;b<81;b++){for(a=0;a<81;a++){x=a;y=b;w=27;while(w&&(x/w+y/w)%2==0){x%=w;y%=w;w/=3;}printf(w?" ":"X");}printf("\n");}}
Note that non-ascii characters in the above source code will be escaped (such as \x9f).
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