J-G, thanks for the problem. Could you add some more information about expected inputs and outputs? An example and some more tests would be helpful too. If your test suite has exactly one test, it's trivial to write a correct answer.
Find common elements in matrix rows
Back to basics 22 - Rotate a matrix
Find the dimensions of a matrix
Check that number is whole number
Three grind is shipsstraigt
Bleed non-zeros to the right using REGEXP, and that sort of cheatcodess...
Order of things - 3
Only once: cleaning up your columns
Operate on matrices of unequal, yet similar, size
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