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Learn a Fact: 2 x 0

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

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