import java.util.*;
public class MainClass {
public static void main(String args[]) {
HashSet set = new HashSet();
String s1 = "abc";
String s2 = "def";
String s3 = "";
set.add(s1);
set.add(s2);
set.add(s1);
set.add(s2);
Iterator i = set.iterator();
while(i.hasNext()){
s3 += (String) i.next();
}
System.out.println(s3);
}
}
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