diff --git a/Option.cs b/Option.cs
index 0b24655..26335d0 100644
--- a/Option.cs
+++ b/Option.cs
@@ -1,4 +1,5 @@
 using System;
+using System.Collections;
 using System.Collections.Generic;
 using System.Linq;
 
@@ -89,6 +90,15 @@ public static Option<R> map<A, R>(this Option<A> @this, Func<A, R> func) {
                 () => Option.None, value => Option.Some(func(value)));
         }
 
+    public static bool exist<A>(this Option<A> @this, Option<A> other) =>
+      @this.fold(
+        () => false,
+        left => other.fold(
+          () => false,
+          right => left.Equals(right)
+            )
+          );
+
         public static Option<R> flatMap<A, R>(this Option<A> @this, Func<A, Option<R>> func) {
             return @this.fold(
                 () => Option.None, func);
diff --git a/bin/Release/funkylib.dll b/bin/Release/funkylib.dll
index d86f551..f46f942 100644
Binary files a/bin/Release/funkylib.dll and b/bin/Release/funkylib.dll differ
diff --git a/bin/Release/funkylib.pdb b/bin/Release/funkylib.pdb
index e62d510..ce57066 100644
Binary files a/bin/Release/funkylib.pdb and b/bin/Release/funkylib.pdb differ
diff --git a/obj/Release/CoreCompileInputs.cache b/obj/Release/CoreCompileInputs.cache
index 4f01bd9..ce241d2 100644
--- a/obj/Release/CoreCompileInputs.cache
+++ b/obj/Release/CoreCompileInputs.cache
@@ -1 +1 @@
-b41efbdb0739bc08d73825ff2d48a3bfc7c45341
+c304f7f8ade77d758475770f8271d01f624fe97c
diff --git a/obj/Release/DesignTimeResolveAssemblyReferencesInput.cache b/obj/Release/DesignTimeResolveAssemblyReferencesInput.cache
index 65376de..153b733 100644
Binary files a/obj/Release/DesignTimeResolveAssemblyReferencesInput.cache and b/obj/Release/DesignTimeResolveAssemblyReferencesInput.cache differ
diff --git a/obj/Release/funkylib.csproj.FileListAbsolute.txt b/obj/Release/funkylib.csproj.FileListAbsolute.txt
index 1a6296a..8ba9b21 100644
--- a/obj/Release/funkylib.csproj.FileListAbsolute.txt
+++ b/obj/Release/funkylib.csproj.FileListAbsolute.txt
@@ -16,3 +16,7 @@ D:\Learning\code-retreat\lib\funkylib\bin\Release\funkylib.dll
 D:\Learning\code-retreat\lib\funkylib\bin\Release\funkylib.pdb
 D:\Learning\code-retreat\lib\funkylib\obj\Release\funkylib.dll
 D:\Learning\code-retreat\lib\funkylib\obj\Release\funkylib.pdb
+F:\Code\Stupid\funkylib\bin\Release\funkylib.dll
+F:\Code\Stupid\funkylib\bin\Release\funkylib.pdb
+F:\Code\Stupid\funkylib\obj\Release\funkylib.dll
+F:\Code\Stupid\funkylib\obj\Release\funkylib.pdb
diff --git a/obj/Release/funkylib.dll b/obj/Release/funkylib.dll
index d86f551..f46f942 100644
Binary files a/obj/Release/funkylib.dll and b/obj/Release/funkylib.dll differ
diff --git a/obj/Release/funkylib.pdb b/obj/Release/funkylib.pdb
index e62d510..ce57066 100644
Binary files a/obj/Release/funkylib.pdb and b/obj/Release/funkylib.pdb differ