1+2
3
1 + 1
2
6 + 6
12
4+2
3 + 3
6
8 + 8
16
5+3
8
2 + 2
4
9 +9
18
3+6
9
5 + 5
10
10 + 10
20
8+2
What is the double fact for 8?
7 + 7
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