Make the following variable:
The third element in the test-suite does not match the image in the problem description.
Get the area codes from a list of phone numbers
Find nearest prime number less than input number
07 - Common functions and indexing 1
Concatenate two strings
02 - Vector Variables 2
04 - Scalar Equations 3
04 - Scalar Equations 2
07 - Common functions and indexing 3
03 - Matrix Variables 3
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