7/8-5/6=21/24-20/24=1/24
6/7-3/10=60/70-21/70=39/70
5/6-2/3=5/6-4/6=1/6
1/4-1/5=5/20-4/20=1/20
17/18-5/6=17/18-15/18=2/18=1/9
7/9-1/4=28/36-9/36=17/36
2/3-1/3=1/3
7/9-5/9=2/9
3/7-2/7=1/7
4/5-2/5=2/5
1-1/2=2/2-1/2=1/2
1-2/5=5/5-2/5=3/5
1-1/3=3/3-1/3=2/3
1-3/10=10/10-3/10=7/10
1-3/4=4/4-3/4=1/4
1-7/9=9/9-7/9=2/9
1-11/20=20/20-11/20=9/20
1-14/22=22/22-14/22=8/22=4/11