Pull Up Constructor Body

You have constructors on subclasses with mostly identical bodies.

Create a superclass constructor; call this from the subclass methods.

class Manager extends Employee...
  public Manager (String name, String id, int grade) {
    _name = name;
    _id = id;
    _grade = grade;
  }

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  public Manager (String name, String id, int grade) {
    super (name, id);
    _grade = grade;
  }