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.
Back and Forth Rows
What is the distance from point P(x,y) to the line Ax + By + C = 0?
letter yes yes & letter no no
Add all the numbers between two limits (inclusive)
Seemingly impossible problem
Arrange the names in alphabetical order (1)
Wait a second!
Curve fitting (linear functions) & function handles
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