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Doubles plus 1
20 cards·by sschmidt
1+2
3
2+1
3
2+3
5
3+2
5
3+4
7
4+3
7
4+5
9
5+4
9
5+6
11
6+5
11
6+7
13
7+6
13
7+8
15
8+7
15
8+9
17
9+8
17
9+10
19
10+9
19
10+11
21
11+10
21
Braineos