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)
Counting in Finnish
The Hitchhiker's Guide to MATLAB
N-Dimensional Array Slice
Longest Sequence of NaNs
Find a real root of a quintic function without using roots function
Write out numbers in words
Check if the input is a strong prime
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