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).
Prime factor digits
Distance walked 2D
Right and wrong
random picture with random colours
Is it an Armstrong number?
Create a recurrence matrix for a vector of data
"Look and say" sequence
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