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.
Script file size
Cell Source Index
String permutations on phone keyboard
It's race time again! Write a function that is at least twice as fast as the test suite call of repmat().
Monte Carlo integration: area of a polygon
Seemingly impossible problem
Arrange the names in alphabetical order (2)
Code breaker, Part I: Operation Phoenix
Just take it easy for a second or two!
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