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Design a personnel management for the People (staff) category. Taking into account the general nature, where only the abstract type of personnel have all the attributes: number (number), sex (gender), birthday (date of birth), id (ID number) and so on. The " birth date" is defined as a " date" class embedded child objects. With members of the personnel function to realize the information recorded and displayed. Requirements include: the constructor and destructor, copy constructor, inline member functions, together.