It's time to help Santa! Every Christmas Santa is as always busy with preparations before his longer-than-7.5-million-kilometer trip around the world. One of the many things he has to worry about is how to pair up his reindeer in front of the sleigh. We all know that Rudolf goes right in front of everyone else because of his shiny nose, but what about his other eight four-legged friends?
We solved it here.
Feel free to use this thread to anything you need about this example.