=
6-2=
6-2=4
6-3=
6-3=3
2+4=
2+4=6
6-5=
6-5=1
6-4=
6-4=2
5-1=
5-1=4
6+1=
6+1=7
0+6=
0+6=6
7-6=
7-6=1
1+6=
1+6=7