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Learn a Fact: 1 x 4

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x4


4

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x1


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1
X 3
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X 5
5
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1
x  0
2
4
x  1
3
1
x  1
4
3
x  0
5
0
x  2
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1
x  5
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1
x  7
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6
x  1
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9
x  1
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3
x  1
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0
x  9
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0
x  6
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5
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x  1
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