Given the vector A, return B in which all numbers in A are doubling. So for:
A = [ 1 5 8 ]
B = [ 1 1 5 5 8 8 ]
Alphabetize by last name
Make one big string out of two smaller strings
Convert a vector into a number
Getting the indices from a matrice
Generate a vector like 1,2,2,3,3,3,4,4,4,4
Divisors of an integer
Solving a quadratic equation
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