3
2 1
2 3
3 2
1 1 3 4
5 5
1 1
2 2
3 3
4 4
5 5
3 3 6 6
2 1 4 5
1 1 2 10
1 1 100 100
1 1 3 3
3 1
999 999
999 999
999 998
1 1 1000 1000