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Learn a Fact: 2 x 1

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

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2

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