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sub. doubles
1.
18 - 9 =
2.
16 - 8 =
3.
14 - 7 =
4.
12 - 6 =
5.
10 - 5 =
6.
8 - 4 =
7.
6 - 3 =
8.
4 - 2 =
9.
2 - 1 =
10.
18 - 9 =
11.
16 - 8 =
12.
14 - 7 =
13.
12 - 6 =
14.
10 - 5 =
15.
8 - 4 =
16.
6 - 3 =
17.
4 - 2 =
18.
2 - 1 =
19.
18 - 9 =
20.
16 - 8=
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