Additional test cases have been added.
Return a list sorted by number of occurrences
Will there be a new leader?
Given a 4x4 matrix, swap the two middle columns
Vector of numbers divisible by 3
Reverse a matrix
Number of odd and even elements within matrix
Relative ratio of "1" in binary number
Make a vector of prime numbers
Create matrix with Gray code
Mean and standard deviation of times in string
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