/* 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
	{
		List<String> arrayList1 = new ArrayList<String>(){{ add("One"); add("Two");   }};
		List<String> arrayList2 = new ArrayList<String>(){{ add("Two"); add("Three"); }};   
        List<String> mergedList = new ArrayList<String>(new HashSet<String>(arrayList1){{ addAll(arrayList2); }});
		System.out.println(mergedList);
	}
}

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