Learn a Fact: 3 x 7

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

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3

x7


21

7

x3


21

Move on to other facts:
3
X 6
18
3
X 8
24