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.
Encode Roman Numerals
Find matching parenthesis
Project Euler: Problem 7, Nth prime
Create a square matrix of multiples
Television Screen Dimensions
Code breaker, Part III: Operation Xiangliu
Anyone for tennis? Your chances of winning a tie-break game
Code breaker, Part II: Operation Orthos
Testing for randomness: uniform distribution of integers
Arrange the names in alphabetical order (1)
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