Learn a Fact: 2 x 0

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

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