0 [1, 1, 2, 1, 1, 2]
2 [1, 2, 1, 2]
1 [2, 2]
0 [2]
! 0 [0]
! 0 [0, 0]
! 0 [0, 0, 0]
! 0 [0, 0, 0, 0]
5
1 1 1 1 1