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    public class Solution {
    
        public static void main(String[] args) {
            
            Bird bird = new Bird();
            bird.walk();
            bird.fly();
            bird.sing();
        }
    }
        
        class Animal{
           void walk(){
            System.out.println("I am walking");
           }
        }
        
         class Bird extends Animal{
           void fly(){
            System.out.println("I am flying");
           }
           
            void sing(){
            System.out.println("I am singing");
           }
        }