delimiters ();
def tracingall=tracingcommands:=3;
 tracingedges:=1; tracingtitles:=1; tracingequations:=1; tracingspecs:=2;
	tracingpens:=1; tracingchoices:=1; tracingstats:=2;
 tracingonline:=1;tracingoutput:=1;tracingmacros:=3 enddef;
tracingall;
edges e[];
e[-20]=nulledges;
addto e[-20] contour ((0,0)..(10,20)..(0,30))..tension 3..cycle;
shipout e[-20];
openwindow 7 from (0,0) to (380,400) at (-250,275);
display e[-20] on 7;
openwindow 5 from (260,250) to (380,300) at (0,40);
display e[-20] on 5;
stop;
end