import java.util.*;
import java.lang.*;
import java.io.*;
 
/* array_unique */
class Ideone
{
	public static void main (String[] args) throws java.lang.Exception
	{
		Integer[] data = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10};
 	 	Set<Integer> set = new HashSet<Integer>(Arrays.asList(data));
		set.toArray();
		System.out.print(set);
	}
}