Create the following variables:
Select every other element of a vector
Get the area codes from a list of phone numbers
Omit columns averages from a matrix
Create matrix of replicated elements
04 - Scalar Equations 3
07 - Common functions and indexing 3
06 - Matrix Equations 3
07 - Common functions and indexing 5
02 - Vector Variables 3
03 - Matrix Variables 5
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