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import java.util.HashSet;
public class HashSetDemo {
    
    HashSet set = new HashSet();

    public static void main(String[] args) {
        HashSetDemo setDemo = new HashSetDemo();
        setDemo.set.add(1);
        setDemo.set.add(2);
        setDemo.set.add(3);
        setDemo.set.add(4);
        System.out.println(setDemo.set);


    }
    
}

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