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diff --git a/Master/texmf/doc/asymptote/examples/twistedtubes.asy b/Master/texmf/doc/asymptote/examples/twistedtubes.asy
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--- a/Master/texmf/doc/asymptote/examples/twistedtubes.asy
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-import graph3;
-import palette;
-
-size(300,300,keepAspect=true);
-
-real w=0.4;
-
-real f(triple t) {return sin(t.x);}
-triple f1(pair t) {return (cos(t.x)-2cos(w*t.y),sin(t.x)-2sin(w*t.y),t.y);}
-triple f2(pair t) {return (cos(t.x)+2cos(w*t.y),sin(t.x)+2sin(w*t.y),t.y);}
-triple f3(pair t) {return (cos(t.x)+2sin(w*t.y),sin(t.x)-2cos(w*t.y),t.y);}
-triple f4(pair t) {return (cos(t.x)-2sin(w*t.y),sin(t.x)+2cos(w*t.y),t.y);}
-
-surface s1=surface(f1,(0,0),(2pi,10),8,8,Spline);
-surface s2=surface(f2,(0,0),(2pi,10),8,8,Spline);
-surface s3=surface(f3,(0,0),(2pi,10),8,8,Spline);
-surface s4=surface(f4,(0,0),(2pi,10),8,8,Spline);
-
-pen[] Rainbow=Rainbow();
-s1.colors(palette(s1.map(f),Rainbow));
-s2.colors(palette(s2.map(f),Rainbow));
-s3.colors(palette(s3.map(f),Rainbow));
-s4.colors(palette(s4.map(f),Rainbow));
-
-defaultrender.merge=true;
-
-draw(s1);
-draw(s2);
-draw(s3);
-draw(s4);