Swap the first and last columns
Remove all the words that end with "ain"
Back to basics 22 - Rotate a matrix
Scoring for oriented dominoes
Length of the hypotenuse
Make a rainbow matrix (follow-up to checkerboard matrix)
Number of paths on a n-dimensional grid
Smallest n, for n! to have m trailing zero digits
Equal temperament - musical notes and frequency
Number of paths on a 3d grid
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