Given two input arrays like this:
Output a string that contains each letter the specified number of times, e.g.:
If given an invalid input (for example, a negative number), output the string 'ERROR'.
Now with improved tests, and reference solution (which I'm sure you can beat).
Whether the input is vector?
Permute diagonal and antidiagonal
"Look and say" sequence
Create a recurrence matrix for a vector of data
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