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diff --git a/Master/texmf/doc/asymptote/examples/trefoilknot.asy b/Master/texmf/doc/asymptote/examples/trefoilknot.asy
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-import tube;
-import graph3;
-import palette;
-currentlight=White;
-
-size(0,8cm);
-currentprojection=perspective(1,1,1,up=-Y);
-
-int e=1;
-real x(real t) {return cos(t)+2*cos(2t);}
-real y(real t) {return sin(t)-2*sin(2t);}
-real z(real t) {return 2*e*sin(3t);}
-
-path3 p=scale3(2)*graph(x,y,z,0,2pi,50,operator ..)&cycle;
-
-pen[] pens=Gradient(6,red,blue,purple);
-pens.push(yellow);
-for (int i=pens.length-2; i >= 0 ; --i)
- pens.push(pens[i]);
-
-path sec=scale(0.25)*texpath("$\pi$")[0];
-coloredpath colorsec=coloredpath(sec, pens,colortype=coloredNodes);
-draw(tube(p,colorsec),render(merge=true));