3/7
3/4
4/10 - 1/10
5/7
4/7 + 1/7
1 - 2/4
8/9 - 1/9
1/9 + 2/9
1
7/10
5/9
5/7 - 2/7
9/10 - 2/10
3/10
3/9 + 2/9
1/2 + 1/2
2/4 + 1/4
3/9
2/4
7/9