Data.MultiMap
data MultiMap k v
null
size
numKeys
numValues
member
notMember
lookup
(!)
empty
insert
delete
map
mapKeys
mapWithKey
foldr
foldl
foldrWithKey
foldlWithKey
elems
keys
keysSet
assocs
toMap
toMapOfSets
toList
fromList
fromMap
findMin
findMax
findMinWithValues
findMaxWithValues