mirror [ LT 270 CURVEl 80 60 RT 270 jt 0 0 ] mirror [ LT 290 CURVEl 80 60 RT 290 jt 0 0 ] bg 409 robot 1 [on speed = 20 dir = 45] robot 2 [ on speed = 30 dir = -45 rgt 100 0 ] robot 1 [on animate 0.2 [ shapewh 125 50 [color white a] shapewh 125 50 [color white b]] ] robot 2 [on animate 0.1 [ shapewh 125 50 [color white a] shapewh 125 50 [color white b]] ]