Learn a Fact: 2 x 2

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2

x2


4

2

x2


4

2
X1
2
2
X3
6
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1
5
x  1
2
1
x  0
3
1
x  3
4
8
x  0
5
2
x  1
6
1
x  6
7
8
x  1
8
9
x  1
9
0
x  3
10
2
x  2
11
4
x  0
12
2
x  2
13
7
x  0
14
4
x  1
15
0
x  6
16
7
x  1
17
0
x  9
18
1
x  1
19
0
x  2
20
0
x  5
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