interface WheelFactory {

    Wheel makeWheel();
    WheelFittingExpert makeFittingExpert();
}

// Car Wheel factory to return car wheel and car expert
class CarWheelFactory implements WheelFactory {

    public Wheel makeWheel() {

        return new CarWheel();
    }

    public WheelFittingExpert makeFittingExpert() {

        return new CarExpert();
    }
}

// Bike Wheel factory to return bike wheel and bike expert
class BikeWheelFactory implements WheelFactory {

    public Wheel makeWheel() {

        return new BikeWheel();
    }

    public WheelFittingExpert makeFittingExpert() {

        return new BikeExpert();
    }
}