Learn a Fact: 2 x 2

1
3
x  1
2
1
x  0
3
1
x  1
4
4
x  0
5
1
x  7
6
4
x  1
7
0
x  8
8
6
x  1
9
7
x  0
10
2
x  1
11
8
x  1
12
3
x  0
13
2
x  2
14
5
x  1
15
0
x  6
16
5
x  0
17
0
x  2
18
9
x  0
19
1
x  9
20
2
x  2

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2

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4

2

x2


4

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X 1
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