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import java.util.Iterator;
import java.util.LinkedHashSet;
import java.util.Set;
public class Main {
public static void main(String[] argv) throws Exception {
Set<String> set = new LinkedHashSet<String>();
// Add some elements
set.add("1");
set.add("2");
set.add("3");
set.add("2");
// List the elements
for (Iterator it = set.iterator(); it.hasNext();) {
Object o = it.next();
}
}
}
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