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15-6=
12-9=
12+8=
11-9=
4+8=
16-4=
7+9=
16-7=
2+17=
12-8=
17-8=
18-1=
15-7=
10-4=
14+6=
16-9=
15+5=
16-8=
14-7=
8+6=