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