Learn a Fact: 2 x 2

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

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2

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2

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4

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