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)
Remove any row in which a NaN appears
Back to basics 18 - justification
Fahrenheit to Celsius converter
find the maximum element of the matrix
Bridge and Torch Problem - Minimum time
Fill the Matrix - 2
Delete the rows in the middle
Decrypt a secret message!
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