0 [6, 2, 10, 9, 8]
0 4
0 1
1 [6, 2, 10, 9, 8]
1 2
1 0
2 [6, 2, 10, 9, 8]
2 3
2 1
3 [6, 2, 10, 9, 8]
3 4
3 2
4 [6, 2, 10, 9, 8]
4 3