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class First{
    public static void main(String args[]){

        Fourth matias[] = new Fourth[3];
        matias[0] = new Second();
        matias[1] = new Third();
        matias[2] = new Fourth();

        for (int x= 0; x < matias.length; x++){
            matias[x].eat();
        }
    }
}

public class Second extends Fourth{

    void eat(){
        System.out.println("This is the coolest.");
    }
}

public class Third extends Fourth{

    void eat(){
        System.out.println("This is cooler.");
    }
}

public class Fourth{

    void eat(){
        System.out.println("This is cool.");
    }
}