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doubles plus one
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A
B
1+2
3
2+3
5
3+4
7
4+5
9
5+6
11
6+7
13
7+8
15
8+9
17
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+8
17
8+7
15
7+6
13
6+5
11
JH
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