Duplicate all elements in the array
The solution to this problem doesn't make any sense!!!
If you are using the word "duplicate" to mean multiply by 2, then the correct answer is [2,4,6], not [1,4,6]
Get the area codes from a list of phone numbers
Project Euler: Problem 3, Largest prime factor
Return unique values without sorting
Create a matrix X, where each column is a shifted copy of the vector v
Divisible by 5
calculate the length of matrix
the average value of the elements
to the 2 all elements
Convert characters into numbers
Converts numbers into characters
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