1 + 1 = 2
2 + 2 = 4
3 + 3 = 6
4 + 4 = 8
5 + 5 = 10
6 + 6 = 12
7 + 7 = 14
8 + 8 = 16
9 + 9 = 18
10 + 10 = 20
11 + 11 = 22
12 + 12 = 24
13 + 13 = 26
14 + 14 = 28
15 + 15 = 30
16 + 16 = 32
17 + 17 = 34
18 + 18 = 36
19 + 19 = 38
20 + 20 = 40
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