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You have to construct a telephone directory system for an organization to maintain a record of employees and their telephone numbers. Use Z-Specification language to
You have to construct a telephone directory system for an organization to maintain a record of employees and their telephone numbers. Use Z-Specification language to formally specify the following functional requirements of a telephone directory system.
- System must be able to add new employee and/or new entries
- System must be able to remove employee and/or existing entries
- System must be able to query the system for employee or number
- An employee may have one or more telephone numbers
- Some employee may not have a telephone number yet
- A number may be shared by two or more employee.
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