using System;
using System.Collections.Generic;
using System.Linq;
class Program
{
private static string ReverseString(string sentence)
{
List<string> words = new List<string>(sentence.Split(' ').ToList());
return words.Aggregate((a, b) => b + " " + a);
}
static void Main(string[] args)
{
string sentence = "this is a test";
string result = ReverseString(sentence);
Console.WriteLine(result);
}
}
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