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.
Sums with Excluded Digits
Better bullseye matrix
Put two time series onto the same time basis
Twist 'n' Match
Code breaker, Part III: Operation Xiangliu
Anyone for tennis? Your chances of winning a tie-break game
Make your own Test Suite (part 2)
"Percentages may not total 100 due to rounding"
Add all the numbers between two limits (inclusive)
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