deleteAll :: Ord k => k -> Multimap k v -> Multimap k v
deleteAll k (Multimap m) = Multimap $ Map.delete k m
deleteAll :: Ord k => k -> Multimap k v -> Multimap k v
deleteAll k (Multimap m) = Multimap $ Map.delete k m
deleteAll k (Multimap m) = Multimap $ Map.delete k m