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+import contour;
+import palette;
+import graph3;
+currentprojection=orthographic(25,10,10);
+size(0,12cm);
+real a=3;
+real b=4;
+real f(pair z) {return (z.x+z.y)/(2+cos(z.x)*sin(z.y));}
+guide[][] g=contour(f,(-10,-10),(10,10),new real[]{8},150);
+
+for(guide p:g[0]){
+ draw(extrude(p,8Z),palered);
+ draw(path3(p),red+2pt);
+}
+
+draw(lift(f,g),red+2pt);
+
+surface s=surface(f,(0,0),(10,10),20,Spline);
+s.colors(palette(s.map(zpart),Rainbow()+opacity(0.5)));
+draw(s);
+axes3("$x$","$y$","$z$",Arrow3);
+