[begin]
1 2
2 8
3 1
4 10
5 -6
[end]
[begin]
1 4
2 7
3 1
4 11
5 -3
[end]
[begin]
1 5
2 10
3 0
4 15
5 -5
[end]
[begin]
1 8
2 8
3 1
4 16
5 0
[end]
