[begin]
1 2
2 6
3 0
4 8
5 -4
[end]
[begin]
1 4
2 9
3 1
4 13
5 -5
[end]
[begin]
1 4
2 6
3 0
4 10
5 -2
[end]
[begin]
1 2
2 1
3 1
4 3
5 1
[end]
[begin]
1 1
2 7
3 1
4 8
5 -6
[end]
