using System;
using System.Linq;
using System.Collections;
using System.Collections.Generic;
public class MainClass {
public static void Main() {
string[] presidents = {"ant", "arding", "arrison", "eyes", "over", "ackson"};
IEnumerable first = presidents.Take(5);
IEnumerable second = presidents.Skip(4);
IEnumerable concat = first.Concat(second);
IEnumerable union = first.Union(second);
Console.WriteLine("The count of the array is: " + presidents.Count());
Console.WriteLine("The count of the first sequence is: " + first.Count());
Console.WriteLine("The count of the second sequence is: " + second.Count());
Console.WriteLine("The count of the concat sequence is: " + concat.Count());
Console.WriteLine("The count of the union sequence is: " + union.Count());
}
}