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.
"global variable z" was explicitly mentioned in both the problem title and the problem description. Other than that, I trust that your comment and the Test Suite should be sufficient to remove any residual doubts.
Project Euler: Problem 6, Natural numbers, squares and sums.
cos for boss?
Detect a number and replace with two NaN's
Rate of event occurence: find percentiles of the distribution (for smallish rates)
Guess the number I'm thinking of (Part 2)
Code breaker, Part III: Operation Xiangliu
What score did they give?
Make your own Test Suite (part 3)
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