Learn a Fact: 2 x 1

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

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