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.
Remove any row in which a NaN appears
What are the odds?
Choose the best fitting dominoes
Community Problem 500!
The Answer to Life, the Universe, and Everything
Arrange the names in alphabetical order (2)
Guess the number I'm thinking of
What score did they give?
Back to basics: adding comments to your code
Computational power of Cody servers
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