Solve given expression.
Note that this problem uses the word solve when it needs to say EVALUATE.
Also the required code to pass the tests shouldn't be available by COPY-AND-PASTE from Test Suite!
Return a list sorted by number of occurrences
Make a random, non-repeating vector.
Sum positive elements of matrix.
Form a square matrix from four square sub-matrices
Select primes from the matrix.
For given xx,x, y vectors build spline of x and y and find yy values for xx vector.
Pointwise multiplication of vectors.
Find product of eigenvalues of n*n magic matrix.
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