it's a bit unclear why padding is necessary in the first two test cases, where the number of characters (15) is already a multiple of the key size (3 or 5, respectively)
Longest Divisor Run
radius of a spherical planet
Specific Element Count
Angle between Two Vectors
Generate a NaN...on purpose
Check if the input is a strong prime
Create initial basic feasible solution for transportation problems - North-West Corner Method
Divide elements by sum of elements
Longest Sequence of NaNs
replace nan values iteratively.
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