4+4
8
1+1
2
10+10
20
7+7
14
6+6
12
13-3
10
12-3
9
20-5
15
14-7
7
10-7
3
11+11
22
13+13
26
8+8
16
9+9
18
15+15
30
25-6
19
34-7
27
48-5
43
47-8
39
54-3
51
34+15
49
12+13
25
53+11
64
17+17
34
15+27
42
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