diff --git a/Linq/Linq-08.linq b/Linq/Linq-08.linq
index 64d4ba2..e8530dc 100644
--- a/Linq/Linq-08.linq
+++ b/Linq/Linq-08.linq
@@ -21,8 +21,6 @@ void Main()
 	shortNames.Dump();
 }
 
-public delegate bool IntegerFilter(int i);
-
 public static class ExtensionsMethods
 {
 	public static List<T> Filter<T>(this List<T> items, Func<T, bool> filter)
diff --git a/Linq/Linq-10.linq b/Linq/Linq-10.linq
deleted file mode 100644
index 90d6ea5..0000000
--- a/Linq/Linq-10.linq
+++ /dev/null
@@ -1,153 +0,0 @@
-<Query Kind="Program" />
-
-//10- Let's write Linq method FirstOrDefault.
-
-//Jon Skeet reimplemented Linq to Objects in an entire series. 
-
-//https://codeblog.jonskeet.uk/2010/09/03/reimplementing-linq-to-objects-part-1-introduction/
-
-//If you want to master Linq, read the series and implent it on your own.
-void Main()
-{
-	List<int> numbers = new List<int>() { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 };
-	
-	var doubleNumbers = numbers.Select(n => n * 2); //IEumerable<int> -> IEnumerable<int>
-
-	var persons2 = numbers.LinqSelect(n => new Person(n)); //IEumerable<int> -> IEnumerable<Person>
-	
-	//PROJECTION 
-	
-	foreach(var person in persons2)
-	{
-		Console.WriteLine(person);
-	}
-
-	//SELECT -> There are two types. 
-	
-	//numbers.LinqFirstOrDefault().Dump();
-}
-
-public class Person 
-{	
-	public int Number { get; set;}	
-	
-	public Person(int number)
-	{
-		Number = number;		
-	}
-	
-	public override string ToString()
-	{
-		return $"Person-{Number}";
-	}
-}
-
-//<Place holder for the type>
-
-public delegate string MyDelegateName(int i); //Specifiy definiition
-
-public delegate TResult MyDelegateName<TInput, TResult>(TInput i);
-
-public delegate TResult FuncX<T,TResult>(T i);
-
-//public delegate MyDelegateName
-//{
-//    i = int 	
-//    output = void
-//}
-
-
-//public struct 
-
-public class IntQueue
-{
-	private List<int> _items = new List<int>();
-	
-	public void Enqueue(int i)
-	{
-	}
-	
-	public int Dequeue()
-	{
-		return 0;
-	}
-}
-
-
-
-//name of generic type that you want to use.
-
-public class Queue<T>
-{
-	private List<T> _items = new List<T>();
-
-	public void Enqueue(T i)
-	{
-
-	}
-
-	public T Dequeue()
-	{
-		throw new NotImplementedException();
-	}
-}
-
-
-
-public delegate Person IntToPersonDelegate(int i);
-public delegate int DoubleIntDelegate(int i);
-
-public delegate TResult IntToX<TResult>(int i);
-
-
-
-public Person GetPersonFromInt(int i)
-{
-	return new Person(i);
-}
-
-
-public int GetDouble(int i)
-{
-	return i * 2;
-}
-
-
-public delegate bool IntegerFilter(int i);
-
-public static class ExtensionsMethods
-{
-	//Does everyone understand it fully?
-	//Let's write SELECT ourselves.
-	public static IEnumerable<T> Filter<T>(this IEnumerable<T> items, Func<T, bool> filter)
-	{
-		foreach (var item in items)
-		{
-			if (filter(item))
-				yield return item;
-		}
-	}
-	
-	public static IEnumerable<TTarget> LinqSelect<TSource, TTarget>(this IEnumerable<TSource> source, Func<TSource, TTarget> map)
-	{
-		foreach(var item in source)
-		{
-			yield return map(item);
-		}
-	}
-
-
-	//Let's implement the default SingleORDefualt and then implement
-	//a better SingleOrDefault that you can use everywhere.
-	public static T LinqSingleOrDefault<T>(this IEnumerable<T> items)
-	{
-		throw new NotImplementedException();
-	}
-
-	//Correct implementation using C# local functions.
-	public static T BetterFirstOrDefault<T>(this IEnumerable<T> items)
-	{
-		throw new NotImplementedException();
-	}
-
-}
\ No newline at end of file