interface ICustomer

{

    void CustomerBehaviour();

}

​

interface IEmployee

{

    void ProfessionalBehaviour();

}

​

interface IStudent : IEmployee

{

    void StudentBehaviour();

}

​

interface IFriend

{

    void FriendlyBehaviour();

}

​

class Person : IEmployee, ICustomer, IStudent, IFriend

{

    public void ProfessionalBehaviour(){}

    public void FriendlyBehaviour(){}

    public void ParentBehaviour(){}

    public void CustomerBehaviour(){}

    public void StudentBehaviour(){}

}

​

public class OfficeSpace

{

    IEmployee _empRef; //Only ProfessionalBehaviour is allowed

}

​

public class Bank

{

    ICustomer _customerRef; //Only CustomerBehaviour is allowed

}

​

public class Training

{

    IStudent _studentRef;

}

​

public class HangOut

{

    IFriend _friendRef;

}

​

public class Program

{

    public static void Main()

    {

    }

}