knots in latex



I found a site full of examples to create knots in latex and it's quite a pain to paint them. They look nice, though. You basically paint them via xy and then place *"holes"* in the parts where you want to make a crossing. Here is an example:
\xy
 (-3.5,3.5)*{}="LEFTTOP";
 (3.5,-3.5)*{}="RIGHTBOTTOM";
 (3.5,3.5)*{}="RIGHTTOP";
 (-3.5,-3.5)*{}="LEFTBOTTOM";
 "LEFTTOP";"RIGHTBOTTOM" **\dir{-}; \POS?(.5)*{\hole}="HOLE";
 "RIGHTTOP";"HOLE" **\dir{-};
 "HOLE";"LEFTBOTTOM" **\dir{-};
 (0,0)*[gray]\xycircle(5,5){-};
\endxy

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