import java.util.*;
import java.lang.*;
 
class Main
{
    public static void main(String[] ar) {
        Set<String> set = new TreeSet<String>();
        set.add("core java");
        set.add("php");
        set.add("j2ee");
        set.add("struts");
        set.add("hibernate");
 
        Iterator<String> itr = set.iterator();
 
        while (itr.hasNext()) {
            System.out.println(itr.next());
        }
        set.remove("php");
 
        while (itr.hasNext()) {
            System.out.println(itr.next());
        }
 
    }
}

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