Make the following variable:
The third element in the test-suite does not match the image in the problem description.
Number of 1s in the Binary Representation of a Number
Project Euler: Problem 6, Natural numbers, squares and sums.
Return the first and last character of a string
length of a vector
03 - Matrix Variables 3
03 - Matrix Variables 1
05 - Vector Equations 3
07 - Common functions and indexing 1
07 - Common functions and indexing 2
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