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.
Find the two most distant points
Find common elements in matrix rows
Roll the Dice!
the fly, the train, the second train, and their Zeno's paradox
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The twelve days of Christmas
Code breaker, Part III: Operation Xiangliu
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Arrange the names in alphabetical order (1)
Arrange the names in alphabetical order (2)
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