Learn a Fact: 2 x 1

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

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