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

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