using System;

​

class TrueLove

{

    string[] words = "True love never runs smooth".Split();

    public string this[Index index] => words[index];

    public string[] this[Range range] => words[range];

}

​

public class Program

{

    public static void Main()

    {

        var love = new TrueLove();      

        Console.WriteLine(love[^1]); // "Smooth"        

        Console.WriteLine(string.Join(" ", love[0..2])); 

    }

}