I think you have to improve the test suite
Implement a ROT13 cipher
Compute a dot product of two vectors x and y
Duplicate a character
Fibonacci-Sum of Squares
Multiply by 3
Solve the set of simultaneous linear equations
Pythagorean perfect squares: find the square of the hypotenuse and the length of the other side
Create a square matrix of multiples
Flip the main diagonal of a matrix
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