rectangle 0 0 60 40
solidpen 128 128 128 0
moveto 5  5
lineto 5  35
lineto 55 35
solidpen 255  0 0 0
polybezier (5,15)  ,  (25,15) (35,30) , (55,30) 
solidpen 0 0 255 0
polybezier (5, 20)  ,  (25,20) (35,22) , (55,22)