beginfig(1); defaultfont := "ptmr7t"; y1 = 300; % globals y2 = 400; y3 = 500; % perpaper y4 = 600; x1 = 40; x2 = 100; % repunit x3 = 200; % basistex x4 = 300; % combinerprogs xl = 500; draw (x1,y2)--(xl,y2); draw (x1,y4)--(xl,y4); label.top("Combiner\nprograms",(x4,y1)); endfig; end;