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30 Cards in this Set

  • Front
  • Back
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
1+2
3
2+3
5
3+4
7
4+5
9
5+6
11
6+7
13
7+8
15
8+9
17
9+10
19
10+11
21