Two robots are to be parachuted onto random locations on an infinite line. When they land, their parachutes detach and remain where they are. The robots may be programmed from the following instruction set:

* Go left one unit
* Go right one unit
* Skip next instruction unless there is a parachute here
* Go to label

Each instruction takes one cycle to execute. Program the robots to collide.

Note: From Microsoft. How cool!