Learn a Fact: 3 x 3

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

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3

x3


9

3

x3


9

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3
X 2
6
3
X 4
12