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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