Please improve the test suite. There is only one test case—three is a recommended minimum, though more may be necessary to completely and adequately test what is being asked.
Which values occur exactly three times?
Multiply a column by a row
Calculate the area of a triangle between three points
Sum the elements in either diagonal of a square matrix
Area of a Square
Matrix Ax=B problem
Sum two matrices
Automatic String Editing
Matrix Max Finder
Vector indexing: lower than mean
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