Column 1
1/5 + 2/5
3/5
3/7 + 1/7
4/7
2/9 + 5/9
7/9
4/11 + 3/11
7/11
1/4 + 2/4
3/4
4/5 - 1/5
3/5
6/7 - 2/7
4/7
8/9 - 3/9
5/9
10/11 - 4/11
6/11
13/15 - 7/15
6/15
2/5
7/10 + 1/10
8/10
4/5
5/8 + 3/8
8/8
1
5/12 + 4/12
9/12
3/4
8/15 + 4/15
12/15
4/5
3/20 + 7/20
10/20
1/2
17/20 - 6/20
11/20
10/13 + 2/13
12/13
1/3 + 1/3
2/3
6/17 + 5/17
11/17
9/10 - 3/10
6/10
3/5
7/8 - 1/8
6/8
3/4
11/12 - 5/12
6/12
3/6
1/2
1/3 + 1/3
2/3
5/6 - 1/6
4/6
2/3
1/6 + 4/6
5/6