Learn a Fact: 2 x 1

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

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