0 [8, 9, 7, 9, 6]
0 4
0 1
1 [8, 9, 7, 9, 6]
1 2
1 0
2 [8, 9, 7, 9, 6]
2 3
2 1
3 [8, 9, 7, 9, 6]
3 4
3 2
4 [8, 9, 7, 9, 6]
4 3