9-1
=8
11+1
=12
17-2
=15
8+3
=11
3-1
=2
14+2
=16
20-1
=19
13-3
=10
20-2
=18
3-3
=0
11+3
=14
14-2
=12
8+2
=10
18-1=
=17
5-2
=3
4-3
=1
5+3
=8
1+1
=2
8-2
=6
5+2
=7
16-3
=13
2+2
=4
17+3
=20
11-2
=9
14 + 1
=15
8+1
=9
2+3
=5
12-1
=11
17+2
=19
5+1
=6
7-3
=4
1+2
=3
17+1
=18
19-3=
=16
11+2
=13
6-1
=5
15-1
=14
10-3
=7
14+3
=17