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