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