[0, 0, 0, 1, 0]
[2, 0, 0, 1, 0]
[2, 3, 0, 1, 0]
[2, 3, 4, 1, 0]
[5, 3, 4, 1, 2]
[5, 3, 4, 1, 2]
5 3 4 1 2