/* 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
	{
		int[] arr = {2, 3, 5, 4, 5, 2, 4, 3, 5, 2, 4, 4, 2, 10};
		Set<Integer> set1 = new HashSet<>();
		Set<Integer> set2 = new HashSet<>();
 
		for (Integer a : arr) {
		  if (set1.add(a) || set2.add(a)) {
		    System.out.print(a + ", ");
		  }
		}
	}
}

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