1/4 = 21/8411/12 = 77/8417/42 = 34/841/2 = 42/845/6 = 70/842/3 = 56/848/21 = 32/843/8 = 21/846/7 = 72/845/6 = 70/849/14 = 54/8421/28 = 63/84
1/4 = 21/84
11/12 = 77/84
17/42 = 34/84
1/2 = 42/84
5/6 = 70/84
2/3 = 56/84
8/21 = 32/84
3/8 = 21/84
6/7 = 72/84
5/6 = 70/84
9/14 = 54/84
21/28 = 63/84