Given two input arrays like this: [5,3,1] ['a','b','c']
Output a string that contains each letter the specified number of times, e.g.:
'aaaaabbbc'
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).
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Remove any row in which a NaN appears
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Project Euler: Problem 6, Natural numbers, squares and sums.
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