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What advantages does a protocol have, in this example, than just purely defining an instance method for HourlyEmployee?
If you implemented a unique instance method to HourlyEmployee, the same result is achieved so how does the protocol add more functionality?
The protocol ensure that the code behavior don't go wrong, so it helps you to avoid some errors based on human error, In this case it helps you showing you an error if you forgot to override the superclass method (pay method).