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import java.util.AbstractSet;

import java.util.HashSet;

public class AbstractSetDemo {

AbstractSet<Integer> 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);

}

}