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.
Arrange Vector in descending order
cos for boss?
Elastic Collision 001: 1-D
Special Relativity 101.
Guess the number I'm thinking of
Anyone for tennis? Your chances of winning a tie-break game
Code breaker, Part I: Operation Phoenix
Make your own Test Suite (part 1)
Back to basics: throwing errors / exceptions
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