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Learn a Fact: 2 x 1

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2

x1


2

1

x2


2

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