NO
NO
YES
[7, 5, 4, 3, 2, 1, 6]
[7, 6, 5, 4, 3, 2, 1]
NO
YES
[5, 4, 3, 2, 6, 1]
[6, 5, 4, 3, 2, 1]
NO
YES
[6, 5, 4, 3, 2, 1]
[5, 6, 3, 4, 1, 2]
YES
[4, 3, 2, 1]
[3, 4, 1, 2]
NO
YES