See [Day 9](https://github.com/ZeroKnight/AdventOfCode/blob/master/Day09/day9.pl), [Day 13](https://github.com/ZeroKnight/AdventOfCode/blob/master/Day13/day13.pl), [Day 17](https://github.com/ZeroKnight/AdventOfCode/blob/master/Day17/day17.pl)
