When the input is certainly not the global variable z, your function must return false. Otherwise return true. All inputs & variable values will be scalar.
Make an N-dimensional Multiplication Table
Read a Soroban Abacus
Number of Circles in a Number
Guess the number I'm thinking of
Curve fitting (linear functions) & function handles
Comparison of floating-point numbers (doubles)
Back to basics: throwing errors / exceptions
Nearly impossible problem
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