Learn a Fact: 2 x 4

1
1
x  9
2
1
x  1
3
0
x  3
4
2
x  2
5
5
x  1
6
0
x  5
7
1
x  2
8
1
x  6
9
4
x  2
10
4
x  0
11
3
x  2
12
1
x  4
13
7
x  0
14
6
x  0
15
7
x  1
16
9
x  0
17
0
x  8
18
3
x  1
19
1
x  8
20
2
x  0

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2

x4


8

4

x2


8

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2
X 3
6
2
X 5
10