[begin]
1 3
2 2
3 1
4 5
5 1
[end]
[begin]
1 3
2 9
3 0
4 12
5 -6
[end]
[begin]
1 5
2 9
3 1
4 14
5 -4
[end]
[begin]
1 1
2 5
3 0
4 6
5 -4
[end]
