10-9= 1
8-7=1
9-6=3
3-0= 3
11-3=8
6-6=0
11-9= 2
7-5=2
14-6=8
9-7=2
2-2=0
7-3=4
8-3=5
5-1=4
12-8=4
11-2=9
3-3=0
12-9=3
10-6=4
7-1=6
11-4=7
16-9=7
4-1=3
15-8=7
4-0=4
15-8=7
10-7=3
6-4=2
11-8=3
8-2=6
11-6=5
6-3=3
16-7=9
12-6=6
9-3=6
12-7=5
13-5=8
7-2=5
12-5=7
7-6=1
