diff --git a/haga.cabal b/haga.cabal
index 196fc8a..a402668 100644
--- a/haga.cabal
+++ b/haga.cabal
@@ -22,6 +22,7 @@ build-type:          Simple
 library
   build-depends:       base
                      , cassava
+                     , containers
                      , extra
                      , MonadRandom
                      , monad-loops
@@ -44,10 +45,12 @@ library
                      , Seminar
                      , Pretty
                      , Szenario191
+                     , LambdaCalculus
 
 executable haga
   build-depends:       base
                      , cassava
+                     , containers
                      , extra
                      , MonadRandom
                      , monad-loops
@@ -71,10 +74,12 @@ executable haga
                      , Seminar
                      , Pretty
                      , Szenario191
+                     , LambdaCalculus
 
 executable haga-test
   build-depends:       base
                      , cassava
+                     , containers
                      , Cabal
                      , extra
                      , MonadRandom
@@ -99,3 +104,4 @@ executable haga-test
                      , Seminar
                      , Pretty
                      , Szenario191
+                     , LambdaCalculus
diff --git a/src/GA.hs b/src/GA.hs
index 2dd423f..552d79f 100644
--- a/src/GA.hs
+++ b/src/GA.hs
@@ -19,7 +19,7 @@
 -- In order to use it for a certain problem, basically, you have to make your
 -- solution type an instance of 'Individual' and then simply call the 'run'
 -- function.
-module GA where
+module GA ( Environment,new, population, mutate, crossover1,crossover, Evaluator, fitness,  Individual, GA.run, tournament, N, R, Population, steps, bests, runTests) where
 
 import Control.Arrow hiding (first, second)
 import Data.List.NonEmpty ((<|))
diff --git a/src/Main.hs b/src/Main.hs
index ce53a67..a3cf242 100644
--- a/src/Main.hs
+++ b/src/Main.hs
@@ -11,8 +11,8 @@ import System.IO
 import Szenario191
 
 data Options = Options
-  { iterations :: N,
-    populationSize :: N
+  { iterations :: !N,
+    populationSize :: !N
   }
 
 options :: Parser Options
diff --git a/src/Test.hs b/src/Test.hs
index a7fbe27..ab82005 100644
--- a/src/Test.hs
+++ b/src/Test.hs
@@ -1,13 +1,29 @@
 {-# LANGUAGE NoImplicitPrelude #-}
+{-# LANGUAGE GADTs #-}
+{-# LANGUAGE MultiParamTypeClasses #-}
+{-# LANGUAGE OverloadedStrings #-}
+{-# LANGUAGE ScopedTypeVariables #-}
+{-# LANGUAGE Trustworthy #-}
+{-# LANGUAGE TypeApplications #-}
+{-# LANGUAGE NoImplicitPrelude #-}
 
 module Main where
 
 import qualified GA
 import Protolude
 import qualified Seminar
+import qualified LambdaCalculus
+import Data.Typeable
+import qualified Type.Reflection as Ref
 
 main :: IO ()
 main = do
   _ <- GA.runTests
   _ <- Seminar.runTests
+  _ <- putStrLn $ ((show (typeRepArgs (Ref.SomeTypeRep (Ref.TypeRep @(Int->Int->Int->Text))))) :: Text)
+  _ <- putStrLn $ ((show (typeRepArgs (Ref.SomeTypeRep (Ref.TypeRep @(Text))))) :: Text)
+  _ <- putStrLn (LambdaCalculus.toLambdaExpressionShort LambdaCalculus.testIntToClassCorrect)
+  _ <- putStrLn $ ((show (LambdaCalculus.res 1)) :: Text)
+  _ <- putStrLn $ ((show (LambdaCalculus.res 2)) :: Text)
+  _ <- putStrLn $ ((show (LambdaCalculus.res 3)) :: Text)
   return ()
diff --git a/stack.yaml b/stack.yaml
index 1fa8a79..07388ee 100644
--- a/stack.yaml
+++ b/stack.yaml
@@ -17,7 +17,7 @@
 #
 # resolver: ./custom-snapshot.yaml
 # resolver: https://example.com/snapshots/2023-01-01.yaml
-resolver: lts-21.25
+resolver: nightly-2024-02-11
 
 # User packages to be built.
 # Various formats can be used as shown in the example below.
diff --git a/stack.yaml.lock b/stack.yaml.lock
index f823d29..d1fc4aa 100644
--- a/stack.yaml.lock
+++ b/stack.yaml.lock
@@ -6,7 +6,7 @@
 packages: []
 snapshots:
 - completed:
-    sha256: a81fb3877c4f9031e1325eb3935122e608d80715dc16b586eb11ddbff8671ecd
-    size: 640086
-    url: https://raw.githubusercontent.com/commercialhaskell/stackage-snapshots/master/lts/21/25.yaml
-  original: lts-21.25
+    sha256: 3693cc17b3c739a22032b7c7bf44aa7ddbeef79311bb9f175e68372f92fc749b
+    size: 600684
+    url: https://raw.githubusercontent.com/commercialhaskell/stackage-snapshots/master/nightly/2024/2/11.yaml
+  original: nightly-2024-02-11