Solve this problem based on clues in the test suite.
Given a 4x4 matrix, swap the two middle columns
select the primes of a vector
Is it an Armstrong number?
Replace every 3rd element in a vector with 4
Rotate Matrix Depending on the input
I told you not separate me, but you did :( - ACDC
Circular Shift Me
Create tangent function out of sin and cos
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