Learn a Fact: 3 x 3

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

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3

x3


9

3

x3


9

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3
X 2
6
3
X 4
12