[Haskell] why I need so much memory????

[Alberto Fuentes Rodriguez]

Hi, I am trying to make a program to generate all the poker hands.
I have done it yet and it only need a few of seconds.

Each card is represented with a Char (to make the structure smaller) and 
then all the hands are a [[Char]]
in total the structure has a size of arround 20Mb.

Now I like be sure that I have all the hands and that they are not repeated. 
To do that I have done the next function:
isRepeated :: Eq a => [a] -> Bool
isRepeated [] = False
isRepeated (p:r) = (any (\x -> x == p) r) || isRepeated r

I call it with a [[Char]] of 2598960 elements and each element with 5 
Characters.

Ok the complexity is high but.... why this program needs 1GB (the structure 
only has 20MB) of memory??
The problem is that it begins to use the swap zone and due to that It can 
only use the 10% of the processor.
I have compiled with the latest version of GHC (ghc --make -C ppal.hs).
I attach you the source files (the backtr works well) and the map memory of 
the process.

Alberto Fuentes

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