I finally understood your problem. The problem description needs some adjustment. It is not clear that it is requesting only the global variable named 'z'. I thought it was referring to every global variable.
7 segment LED display
2 b | ~ 2 b
Volume of a Parallelepiped
Spot the outlier
Given a matrix, swap the 2nd & 3rd columns
Computational power of Cody servers
Curve fitting (non-linear functions) & function handles
Make your own Test Suite (part 1)
The other half of the Fibonacci sequence
Add all the numbers between two limits (inclusive)
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