0 [8, 10, 1, 2, 4]
0 4
0 1
1 [8, 10, 1, 2, 4]
1 2
1 0
2 [8, 10, 1, 2, 4]
2 3
2 1
3 [8, 10, 1, 2, 4]
3 4
3 2
4 [8, 10, 1, 2, 4]
4 3
0 [8, 10, 5, 4]
0 3
0 1
1 [8, 10, 5, 4]
1 2
1 0
2 [8, 10, 5, 4]
2 3
2 1
3 [8, 10, 5, 4]
3 4