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lang-py
set(np.matrix([1,2,1,2]))) is quite different from the solution I have posted. Yours converts the matrix[1 2 1 2]into a set{1, 2}, while mine converts a comprehension of tuples into a set. So yours is one level beneath what I have described in my answer. A more appropriate example would beset([np.matrix([1,2,1,2]), np.matrix([1,2,1,3])]), which produces{(1,2,1,2), (1,2,1,3)}, which is actually in line with the question.