END{for(i=-3;i++<38;)for(j=-3;j<39;)printf j++<38?(5<i&&i<30&&5<j&&j<30?i/12~/^1/&&j/12~/^1/?i/4~/^4/&&j/4~/^4/?i*j%2:i%4&&j%4:i%6&&j%6:(i+2)%8&&(j+2)%8)?" ":"[]":RS}
Note that non-ascii characters in the above source code will be escaped (such as \x9f).