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.
"global variable z" was explicitly mentioned in both the problem title and the problem description. Other than that, I trust that your comment and the Test Suite should be sufficient to remove any residual doubts.
middleAsColumn: Return all but first and last element as a column vector
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What score did they give?
Just take it easy for a second or two!
Arrange the names in alphabetical order (1)
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