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)
Make a checkerboard matrix
Find common elements in matrix rows
Decode a simplified barcode
Geometry: Find Circle given 3 Non-Colinear Points
Modular multiplicative inverse
Number of Even Elements in Fibonacci Sequence
Determine if input is a valid AHP evaluation matrix
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Digit concentration in Champernowne's constant
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