lookup :: Ord key => key -> Map key elt -> Maybe elt
fromList :: Ord key => [(key,elt)] -> Map key elt
fromListWith :: Ord k => (a -> a -> a) -> [(k, a)] -> Map k a
lookup :: Ord key => key -> Map key elt -> Maybe elt
fromList :: Ord key => [(key,elt)] -> Map key elt
fromListWith :: Ord k => (a -> a -> a) -> [(k, a)] -> Map k a