It needs more test cases. It is not clear what the output should be for all possible x.
Finding Perfect Squares
Find relatively common elements in matrix rows
Increment a number, given its digits
Create a matrix X, where each column is a shifted copy of the vector v
Grouped Frequency Distributions
Area under standard normal curve
Cryptography with A Square Matrix : Encoding
Challenging perms function!
Find a real root of a quintic function without using roots function
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