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4/5x1/2=2/5
2/7x1/3=2/21
4/7x1/2=2/7
5/9x1/3=5/27
1 1/2x1/3=3/2x1/3=1/2
9/4x1/6=3/8
21/5x1/7=3/5
18/7x1/9=2/7
62/3x1/31=2/3
51/5x1/9=51/45=1 6/45=1 2/15
112/11x1/21=16/33
100/99x1/15=20/297