/* 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
	{
		LinkedList <Integer> list = new LinkedList<Integer>() ;
        list.add(2); 
        list.add(3); 
        list.add(4); 
        list.add(1); 
        list.add(0); 
        int initialSize = list.size();
        for( int i = 0 ; i < initialSize; i++) {   
          list.add(list.get(i));
        }
 
        System.out.println(list);
	}
}

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