Given a matrix, find all elements that exist in every row.
For example, given
A = 1 2 3 5 9 2 5 9 3 2 5 9 1 2 1 5 5 1 3 2
the answer would be the vector '2 5'. Elements should be returned sorted ascending.
Note there is no guarantee that there are any such elements; if there are none, the routine should return the empty set. Also, the matrix might contain NaNs, repeats, or very large or very small elements.
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