Learn a Fact: 2 x 0

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

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