If the input is a negative number, generate an error. Otherwise, return the number.
Which values occur exactly three times?
Extract leading non-zero digit
Back to basics 20 - singleton dimensions
Back to basics 21 - Matrix replicating
Getting the indices from a vector
Connect Four: find winning move
Check if vertices form a rectangle
Convert matrix to 3D array of triangular matrices
Find the nearest prime number
Cumulative maximum of an array
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