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.
Spherical radius given four points
Top of the Hour : Return from your routine within 1 second of the hour
Find the nearest integer
Code breaker, Part II: Operation Orthos
Rate of event occurence: find percentiles of the distribution (for smallish rates)
The twelve days of Christmas
Guess the number I'm thinking of
Comparison of floating-point numbers (singles)
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