[Haskell] How to substract a list?

[Bright Sun]

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.  


		
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