/* package whatever; // don't place package name! */
 
import java.util.*;
import java.lang.*;
import java.io.*;
 
/* Name of the class has to be "Main" only if the class is public. */
class Ideone
{
	public static void main (String[] args) throws java.lang.Exception
	{
 
      Set<String> st = new HashSet<>();
      st.add("st");
      st.add("foo");
 
      Set<String> st2 = st;
      st2.add("another");
 
      st.stream().forEach(System.out::println);
      System.out.println("\n------------------\n");
      st2.stream().forEach(System.out::println);
	}
}

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