Create a "rainbow matrix" as described in the following examples
Input = 3
Output = [ 1 2 3
2 3 2
3 2 1 ] Input = 5
Output = [ 1 2 3 4 5
2 3 4 5 4
3 4 5 4 3
4 5 4 3 2
5 4 3 2 1 ]
Interesting... nice..
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Count decimal digits of a number
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