Learn a Fact: 2 x 1

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