Learn a Fact: 2 x 1

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

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