2/3 +5/3
8/3 - 7/3
7/6 - 1/2
7/3 - 4/5
5/6 +8/3
5/3 - 2/3
15/ 4 - 1/5
1/4 - 1/6
23/15
71/20
2/3
1/12
1/3
1
