gap>  gc:=ReadLinkImageAsGaussCode("myknot.pdf");
[ [ [ -2, 4, -1, 3, -3, 2, -4, 1 ] ], [ -1, -1, 1, -1 ] ]
gap> Q:=PresentationKnotQuandle(gc);
Quandle presentation of 4 generators and 4 relators.
