Code for the question at http://codereview.stackexchange.com/questions/23901/code-jam-alien-language

Code Jam Alien Language.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.IO;
using System.Text.RegularExpressions;

namespace CodeJamPractice
{
	class Program
	{
		private const string BaseFolderPath = @"C:\path\to\CodeJam\";
	
		static void Main(string[] args)
		{
			var inputLines = File.ReadAllLines(BaseFolderPath + @"AlienLanguage\A-large-practice.in");

			//GetWordlength / DictionaryLength / Number of testCases 
			string[] ldnValues = inputLines[0].Split(' ');

			int LettersInWord = int.Parse(ldnValues[0]);
			int WordsInLanguage = int.Parse(ldnValues[1]);
			int NumberOfTestCases = int.Parse(ldnValues[2]);

			// Create a dictionary of (test case number , test case string) so that it can be paralellised and still keep its test number
			int index = 1;
			Dictionary<int, string> testCasesWithIndex = inputLines.Skip(1 + WordsInLanguage).Take(NumberOfTestCases).ToDictionary(x => index++, x => x);
			var resultDict = new Dictionary<int, string>();

			string allWords = string.Join("|", inputLines.Skip(1).Take(WordsInLanguage));

			testCasesWithIndex.AsParallel().ForAll(kvp =>
			{
				int testCaseNumber = kvp.Key;
				string testCase = kvp.Value;
				var possibleValues = Regex.Matches(allWords, testCase.Replace("(", "[").Replace(")", "]"));

				string result = string.Format("Case #{0}: {1}", testCaseNumber, possibleValues.Count);
				resultDict[kvp.Key] = result;
			});
			string output = string.Join("\n", resultDict.OrderBy(kvp => kvp.Key).Select(kvp => kvp.Value));
			File.WriteAllText(BaseFolderPath + @"AlienLanguage\output.txt", output);
		}
	}
}