abstract class Vehicle

{

     void collide(Vehicle a, Vehicle b){ System.out.println("Unspecified collision"); }

     void collideCarDash(Car a, Vehicle b){ System.out.println("Unspecified collision"); }

     void collideCarCar(Car a, Car b){ System.out.println("Unspecified collision"); }

     void collideCarBike(Car a, Bike b){ System.out.println("Unspecified collision"); }

     void collideCarBus(Car a, Bus b){ System.out.println("Unspecified collision"); }

     void collideBikeDash(Bike a, Vehicle b){ System.out.println("Unspecified collision"); }

     void collideBikeCar(Bike a, Car b){ System.out.println("Unspecified collision"); }

     void collideBikeBike(Bike a, Bike b){ System.out.println("Unspecified collision"); }

     void collideBikeBus(Bike a, Bus b){ System.out.println("Unspecified collision"); }

     void collideBusDash(Bus a, Vehicle b){ System.out.println("Unspecified collision"); }

     void collideBusCar(Bus a, Car b){ System.out.println("Unspecified collision"); }

     void collideBusBus(Bus a, Bus b){ System.out.println("Unspecified collision"); }

     void collideBusBike(Bus a, Bike b){ System.out.println("Unspecified collision"); }

};

class Car extends Vehicle

{

     void collide(Vehicle a, Vehicle b) { a.collideCarDash(this, b); }

     void collideCarDash(Car a, Vehicle b) { b.collideCarCar(this, a); }

     void collideBikeDash(Bike a, Vehicle b) { b.collideCarBike(this, a); }

     void collideBusDash(Bus a, Vehicle b) { b.collideCarBus(this, a); }

     void collideCarCar(Car a, Car b) { System.out.println("Car hits Car and Car"); }

     void collideCarBus(Car a, Bus b) { System.out.println("Car hits Car and Bus"); }

     void collideCarBike(Car a, Bike b) { System.out.println("Car hits Car and Bike"); }

     void collideBikeBike(Bike a, Bike b) { System.out.println("Car hits Bike and Bike"); }

     void collideBikeCar(Bike a, Car b) { System.out.println("Car hits Bike and Car"); }

     void collideBikeBus(Bike a, Bus b) { System.out.println("Car hits Bike and Bus"); }

     void collideBusBus(Bus a, Bus b) { System.out.println("Car hits Bus and Bus"); }

     void collideBusCar(Bus a, Car b) { System.out.println("Car hits Bus and Car"); }

     void collideBusBike(Bus a, Bike b) { System.out.println("Car hits Bus and Bike"); }

}

class Bike extends Vehicle

{

     void collide(Vehicle a, Vehicle b) { a.collideBikeDash(this, b); }

     void collideCarDash(Car a, Vehicle b) { b.collideBikeCar(this, a); }

     void collideBikeDash(Bike a, Vehicle b) { b.collideBikeBike(this, a); }

     void collideBusDash(Bus a, Vehicle b) { b.collideBikeBus(this, a); }

     void collideCarCar(Car a, Car b) { System.out.println("Bike hits Car and Car"); }

     void collideCarBus(Car a, Bus b) { System.out.println("Bike hits Car and Bus"); }

     void collideCarBike(Car a, Bike b) { System.out.println("Bike hits Car and Bike"); }

     void collideBikeBike(Bike a, Bike b) { System.out.println("Bike hits Bike and Bike"); }

     void collideBikeCar(Bike a, Car b) { System.out.println("Bike hits Bike and Car"); }

     void collideBikeBus(Bike a, Bus b) { System.out.println("Bike hits Bike and Bus"); }

     void collideBusBus(Bus a, Bus b) { System.out.println("Bike hits Bus and Bus"); }

     void collideBusCar(Bus a, Car b) { System.out.println("Bike hits Bus and Car"); }

     void collideBusBike(Bus a, Bike b) { System.out.println("Bike hits Bus and Bike"); }

}

class Bus extends Vehicle

{

     void collide(Vehicle a, Vehicle b) { a.collideBusDash(this, b); }

     void collideCarDash(Car a, Vehicle b) { b.collideBusCar(this, a); }

     void collideBikeDash(Bike a, Vehicle b) { b.collideBusBike(this, a); }

     void collideBusDash(Bus a, Vehicle b) { b.collideBusBus(this, a); }

     void collideCarCar(Car a, Car b) { System.out.println("Bus hits Car and Car"); }

     void collideCarBus(Car a, Bus b) { System.out.println("Bus hits Car and Bus"); }

     void collideCarBike(Car a, Bike b) { System.out.println("Bus hits Car and Bike"); }

     void collideBikeBike(Bike a, Bike b) { System.out.println("Bus hits Bike and Bike"); }

     void collideBikeCar(Bike a, Car b) { System.out.println("Bus hits Bike and Car"); }

     void collideBikeBus(Bike a, Bus b) { System.out.println("Bus hits Bike and Bus"); }

     void collideBusBus(Bus a, Bus b) { System.out.println("Bus hits Bus and Bus"); }

     void collideBusCar(Bus a, Car b) { System.out.println("Bus hits Bus and Car"); }

     void collideBusBike(Bus a, Bike b) { System.out.println("Bus hits Bus and Bike"); }

}

public class Main {

    /**

     * @param args

     */

    public static void main(String[] args) {

        Vehicle a = new Car();

        Vehicle b = new Bike();

        Vehicle c = new Bus();

        a.collide(a, a);

        a.collide(a, b);

        a.collide(a, c);

        a.collide(b, a);

        a.collide(b, b);

        a.collide(b, c);

        a.collide(c, a);

        a.collide(c, b);

        a.collide(c, c);

        b.collide(a, a);

        b.collide(a, b);

        b.collide(a, c);

        b.collide(b, a);

        b.collide(b, b);

        b.collide(b, c);

        b.collide(c, a);

        b.collide(c, b);

        b.collide(c, c);

        c.collide(a, a);

        c.collide(a, b);

        c.collide(a, c);

        c.collide(b, a);

        c.collide(b, b);

        c.collide(b, c);

        c.collide(c, a);

        c.collide(c, b);

        c.collide(c, c);

    }