diff --git a/Data/DimensionalHash.hs b/Data/DimensionalHash.hs
--- a/Data/DimensionalHash.hs
+++ b/Data/DimensionalHash.hs
@@ -11,36 +11,31 @@
 import Data.Int
 import Data.Word
 
--- |Return an element having all bits set to 0, excepting the bit at n
-takeBitAt :: (Bits a) => a -> Int -> a
-takeBitAt x n = x .&. (shiftL 1 n)
-
--- |Return a list have shifted elements by (n + index)
-shiftElements :: (Bits a) => [a] -> Int -> [a]
-shiftElements [] n = []
-shiftElements (x:xs) n = [(shiftL x n)] ++ (shiftElements xs (n+1))
-
--- |Return a list have been shifted elements by n + index
-concatBits :: (Bits a) => [a] -> Int -> Int -> a
-concatBits list n npos = foldl (\acc x -> acc .|. x) 0 shiftedMap
-	where 	
-		shiftedMap = shiftElements mapList npos
-		mapList = map (\x -> (takeBitAt x n)) list
-
-hash :: (Bits a) => [a] -> Int -> Int -> Int -> a
-hash list n npos precision
-	| length list == 1 = head list
-	| n < precision = (concatBits list n npos) .|. (hash list (n + 1) (npos + (length list) - 1) precision)
-	| otherwise = 0
+import Control.Exception
+import Data.Typeable
 
 -- | recursevely compute the morton number.	
-class (Bits a) => (MortonNumber a) where	
+class (Bits a, Integral a) => (MortonNumber a) where	
 	dimensionalHash :: (Bits a) => [a] -> a
-	dimensionalHash list = hash list 0 0 (bitSize (head list))
+	dimensionalHash [] = 0
+	dimensionalHash list = hash list 0 (bitSize (head list))
+	
+	maxBitSize :: (Bits a) => [a] -> Int
+	maxBitSize list = div (bitSize (head list)) (length list)
+	
+	maxSize :: (Bits a) => [a] -> Int
+	maxSize list = 2 ^ (maxBitSize list)
+	
+	isHashable :: (Bits a) => [a] -> Bool
+	isHashable [x] = True
+	isHashable list = (length filteredList) == 0
+		where
+			filteredList = filter (\x -> (fromIntegral x) > (maxSize list)) list
 
 -- Integer haven't a fixed bitsize
 instance MortonNumber Integer where
-	dimensionalHash list = hash list 0 0 32
+	dimensionalHash list = hash list 0 32
+	maxBitSize list = div 32 (length list)
 
 -- Types that have a fixed bitsize are instance of MortonNumber
 instance MortonNumber Int8
@@ -53,3 +48,24 @@
 instance MortonNumber Word32
 instance MortonNumber Word64
 
+hash :: (Bits a) => [a] -> Int -> Int -> a
+hash list n precision
+	| length list == 1 = head list
+	| n < precision = (concatBits list n) .|. (hash list (n + 1) precision)
+	| otherwise = 0
+
+-- |Return a list have been shifted elements by n + index
+concatBits :: (Bits a) => [a] -> Int -> a
+concatBits list n = foldl (\acc x -> acc .|. x) 0 shiftedMap
+	where 	
+		shiftedMap = shiftElements mapList (n * ((length list) - 1))
+		mapList = map (\x -> (takeBitAt x n)) list
+		
+-- |Return a list have shifted elements by (n + index)
+shiftElements :: (Bits a) => [a] -> Int -> [a]
+shiftElements [] n = []
+shiftElements (x:xs) n = [(shiftL x n)] ++ (shiftElements xs (n+1))
+
+-- |Return an element having all bits set to 0, excepting the bit at n
+takeBitAt :: (Bits a) => a -> Int -> a
+takeBitAt x n = x .&. (shiftL 1 n)
diff --git a/DimensionalHash.cabal b/DimensionalHash.cabal
--- a/DimensionalHash.cabal
+++ b/DimensionalHash.cabal
@@ -1,5 +1,5 @@
 name:          DimensionalHash
-version:       0.1.3
+version:       0.1.4
 build-Type:    Simple
 cabal-version: >= 1.6
 tested-with:   GHC == 7.0.3
diff --git a/Setup.hs b/Setup.hs
--- a/Setup.hs
+++ b/Setup.hs
@@ -1,2 +1,2 @@
 import Distribution.Simple
-main = defaultMainWithHooks defaultUserHooks
+main = defaultMain