2 _ 1 = 2
8 _ 9 = 72
6 _ 2 = 8
10 _ 7 = 3
2 _ 1 = 1
7 _ 2 = 14
20 _ 20 = 0
17 _ 6 = 11
4 _ 3 = 12
19 _ 12 = 7
10 _ 10 = 20
9 _5 = 45
30 _ 20 = 10
6 _ 3 = 9
5 _ 7 = 12
2 _ 2 = 4
8 _ 1 = 9
6 _10 = 60
