PART 2
[]
[x:?]
[y:?, x:?]
[y:1, x:?]
[f:{}, y:1, x:?]
[x:2, f:{}, y:1, x:?]
[x:1, x:2, f:{}, y:1, x:?]
[x:0, x:1, x:2, f:{}, y:1, x:?]
[x:1, x:2, f:{}, y:2, x:?]
[x:2, f:{}, y:5, x:?]
[f:{}, y:5, x:5]
[y:5, x:5]
[]

PART 3
1. 33
2. 26