2 x 6 =
2 x 7 =
2 x 3 =
2 x 8 =
2 x 4 =
2 x 1 =
2 x 2 =
2 x 9 =
2 x 5 =
2 x 10 =
16
10
6
14
2
12
8
18
4
20
