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)
Use of regexp
Multiply 2 numbers
Celsius to Kelvin
Volume of a Simplex
Bridge and Torch Problem - Length of Unique Time List
Delete the rows in the middle
Find two triangular numbers whose sum is input.
Fill the Matrix - 2
Produce the following matrix
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