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)
Which values occur exactly three times?
Find the alphabetic word product
Return a list sorted by number of consecutive occurrences
Sophie Germain prime
MATCH THE STRINGS (2 CHAR) very easy
Longest Sequence of NaNs
Calculate F statistics ( One-way Analysis of Variance)
Basic Monte Carlo Simulation
Mean = Standard Deviation
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