GOAL SITUATION:  
• We want to move cars so that:  
  – curb4 ends up with car4 on it.  
  – curb3 ends up with car3 on it.  
  – curb2 ends up with car2 on it.  
  – curb1 ends up with car1 on it.  
  – curb0 ends up with car0 on it, and car5 behind car0.