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.
Duplicate each element of a vector.
Calculate a modified Levenshtein distance between two strings
Say something funny
Comparison of floating-point numbers (doubles)
Wait a second!
Arrange the names in alphabetical order (2)
Seemingly impossible problem
Guess the number I'm thinking of
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