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import java.util.HashSet;
public class HashSetDemo14 {
public static void main(String[] args) {
HashSet set = new HashSet();
HashSet set1 = new HashSet();
set.add("A");
set.add("a");
set.add("B");
set.add("b");
set1.add("A");
set1.add("a");
set1.add("B");
System.out.println(set1);
Boolean b = set.containsAll(set);
System.out.println(b);
}
}
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