查找IEnumerable<T>集合的二元组组合，C#

using System;
using System.Collections.Generic;
using System.Linq;

public class Program
{
    public static void Main()
    {
        List<int> numbers = new List<int> { 1, 2, 3, 4, 5 };
        
        var combinations = numbers.SelectMany((x, i) => numbers.Skip(i + 1).Select(y => new Tuple<int, int>(x, y)));
        
        foreach (var combination in combinations)
        {
            Console.WriteLine($"({combination.Item1}, {combination.Item2})");
        }
    }
}