unitsize(.8cm); draw((0,0)..(2,2)..(0,4),1bp+red,Arrow); draw((2,0)..(4,2)..(2,4),1bp+red,ArcArrow); draw((4,0)..(6,2)..(4,4),1bp+red,Arrow(SimpleHead)); draw((6,0)..(8,2)..(6,4),1bp+red,ArcArrow(SimpleHead)); shipout(bbox(5mm,white));