5/12 + 4/12
5/12 - 4/12
1/12
1/2 + 3/4
5/4
3/4 - 1/2
1/4
4/5 + 1/3
17/15
4/5 - 1/3
7/15
3/7 + 2/5
29/35
3/7 - 2/5
1/35
4/9 + 3/7
55/63
4/9 - 3/7
1/63
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