0
1
2
3
4
[[0, 0], [0, 1], [0, 2], [0, 3]]
5
6
7
8
9
[[0, 5], [0, 6], [0, 7], [0, 8]]
10
11
12
13
[[0, 10], [0, 11], [0, 12], [0, 13]]
14
15
16
17
[[0, 14], [0, 15], [0, 16], [0, 17]]
