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import java.util.AbstractSet;
import java.util.HashSet;
public class AbstractSetDemo {
    AbstractSet demo = new HashSet();
    public static void main(String[] args) {
        AbstractSetDemo a = new AbstractSetDemo();
        a.demo.add(1);
        a.demo.add(2);
        a.demo.add(3);
        a.demo.add(4);
        System.out.println(a.demo);
    }
    
}

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