using System;

public class Program

{

    const string AreEqual = "are equal";

    const string NotEqual = "not equal";

    public static void Main()

    {

        var car = new Car();

        var suv = new Suv();

        var validator = new Validator();

        var isEqual = validator.IsWheelNumberEqual(car, suv);

        var caption = isEqual ? AreEqual : NotEqual;

        Console.WriteLine($"The number of wheels of a Car and Suv are {caption}");

        var bike = new Bike();

        var tricycle = new Tricycle();

        isEqual = validator.IsWheelNumberEqual(bike, tricycle);

        caption = isEqual ? AreEqual : NotEqual;

        Console.WriteLine($"The number of whells of a Bike and Tricycle are {caption}");

    }

    class Validator

    {

        public bool IsWheelNumberEqual(Car car, Tricycle tricycle)

        {

            return car.GetNumberOfWheels() == tricycle.GetNumberOfWheels();

        }

        public bool IsWheelNumberEqual(Car car, Suv suv)

        {

            return car.GetNumberOfWheels() == suv.GetNumberOfWheels();

        }

        public bool IsWheelNumberEqual(Bike bike, Tricycle tricycle)

        {

            return bike.GetNumberOfWheels() == tricycle.GetNumberOfWheels();

        }   

    }

    sealed class Car

    {

        public int GetNumberOfWheels() => 4;

    }

​

    sealed class Tricycle

    {

        public int GetNumberOfWheels() => 3;

    }

​

    sealed class Bike

    {

        public int GetNumberOfWheels() => 2;

    }

    sealed class Suv

    {

        public int GetNumberOfWheels() => 4;

    }

}