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.
Create a matrix from a cell
Largest Twin Primes
Raise Matrix to Power
What score did they give?
Back to basics: throwing errors / exceptions
Comparison of floating-point numbers (doubles)
Code breaker, Part III: Operation Xiangliu
Testing for randomness: uniform distribution of integers
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