using System;

​

​

public class Car

{

    public string Move;

    public string Stop;

}

​

public class Move

{

}

​

public class Stop

{

}

​

public class Truck : Car

{

    public string CarryCargo;

}

​

public class CarryCargo

{

}

​

public class FireTruck : Car

{

    public string QuenchTheFire;

}

​

public class QuenchTheFire

{

}

​