Learn a Fact: 2 x 2

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2

x2


4

2

x2


4

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