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