7-4=
3
9-4=
5
6-4=
2
6-5=
1
5-5=
0
7-3=
4
4-2=
2
8-4=
4
5-2=
3
10-6=
4
4-3=
1
3-1=
2
2-1=
1
8-3=
5
10-5=
5