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doubles
20 cards·by Colvog49
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
20-10
10
18 - 9
9
16 -8
8
14 - 7
7
12 - 6
6
10 -5
5
8 - 4
4
6 -3
3
4 - 2
2
2 -1
1