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    class Arithmetic{ int add(int x, int y){ return x+y; } }

    class Adder extends Arithmetic{

    }

    public class Solution {

    public static void main(String[] args) {
        System.out.println("My superclass is: Arithmetic"); 
        Adder a = new Adder();
        System.out.print(a.add(12, 30)+" ");
        System.out.print(a.add(10, 3)+" ");
        System.out.print(a.add(10, 10)+" ");
    }
    

    }