[Haskell] How to substract a list?

In Haskell, ++ can spends second list argument onto the end of first list argument. How to substract the second list from the first list? For example, [(5,1),(4,1),(3,1),(2,1),(1,1)] substract [(2,1),(1,1)] I want to get result list: [(5,1),(4,1),(3,1)] Tks. __________________________________ Do you Yahoo!? Make Yahoo! your home page http://www.yahoo.com/r/hs