diff --git a/code/Angabe5.hs b/code/Angabe5.hs
index e222545..b237dc3 100644
--- a/code/Angabe5.hs
+++ b/code/Angabe5.hs
@@ -27,7 +27,7 @@ class Eq a => Menge_von a where
 
    -- Protoimplementierungen
    leer = []
-   vereinige xs ys     = clear_duplicates (xs ++ ys)
+   vereinige xs ys     = xs ++ ys
    schneide xs ys      = xs \\ (xs \\ ys)
    ziehe_ab xs ys      = xs \\ (intersectBy (==) xs ys)
    ist_teilmenge xs ys = (length (ziehe_ab xs ys) == 0)
@@ -37,14 +37,6 @@ class Eq a => Menge_von a where
    ist_leer xs         = xs == leer
    sind_gleich xs ys   = ist_teilmenge xs ys && ist_teilmenge ys xs
 
-clear_duplicates :: Eq a => [a] -> [a]
-clear_duplicates [] = []
-clear_duplicates (x:xs) = x : filter (/= x) (clear_duplicates xs)
-
-has_duplicates:: Eq a => [a] -> Bool
-has_duplicates [] = False
-has_duplicates (x:xs) = if x `elem` xs then True else has_duplicates xs
-
 -- Weitere Typen:
 
 newtype Paar a b = P (a,b) deriving (Eq,Show)
@@ -101,6 +93,14 @@ is_correct_num n =
       F -> False
       _ -> True
 
+clear_duplicates :: Eq a => [a] -> [a]
+clear_duplicates [] = []
+clear_duplicates (x:xs) = x : filter (/= x) (clear_duplicates xs)
+
+has_duplicates:: Eq a => [a] -> Bool
+has_duplicates [] = False
+has_duplicates (x:xs) = if x `elem` xs then True else has_duplicates xs
+
 -- Aufgabe A.1
 
 instance Num Zahlraum_0_10 where
@@ -163,10 +163,13 @@ build_pairs fkt arg
 -- Aufgabe A.3
 
 instance Menge_von Int where
+   vereinige xs ys     = clear_duplicates (xs ++ ys)
 
 instance Menge_von Zahlraum_0_10 where
+   vereinige xs ys     = clear_duplicates (xs ++ ys)
 
 instance Menge_von Funktion where
+   vereinige xs ys     = clear_duplicates (xs ++ ys)
 
 -- Aufgabe A.4
 
@@ -180,14 +183,17 @@ instance Eq a => Eq (ElemTyp a) where
    (==) (ET a) (ET b) = a == b
 
 instance Show a => Show (ElemTyp a) where
+   show (ET a) = show a
 
 -- Aufgabe A.6
 
 instance Eq a => Menge_von (ElemTyp a) where
+   anzahl x xs = (length . filter (== x)) xs
 
 -- Aufgabe A.7
 
 instance (Eq a,Eq b,Eq c,Eq d,Eq e) => Menge_von (PH_ElemTyp a b c d e) where
+   vereinige xs ys     = clear_duplicates (xs ++ ys)
 
 -- Aufgabe A.8
 
diff --git a/code/Test5.hs b/code/Test5.hs
index a3586d0..75597b2 100644
--- a/code/Test5.hs
+++ b/code/Test5.hs
@@ -78,10 +78,10 @@ spec =
 		  funktion_tests,
 		  menge_von_int_tests,
 		  menge_von_zahlraum_0_10_tests,
-		  menge_von_funktion_tests
-		--  menge_von_ElemTyp_tests,
-		--   ph_elemtyp_tests,
-		--   ph_elemtyp'_tests
+		  menge_von_funktion_tests,
+		  menge_von_ElemTyp_tests,
+		  ph_elemtyp_tests,
+		  ph_elemtyp'_tests
 		]
 
 zahlraum_0_10_tests :: TestTree