`sig
type key = T.t
type 'a t = 'a Map.Make(T).t
val empty : 'a t
val is_empty : 'a t -> bool
val mem : key -> 'a t -> bool
val add : key -> 'a -> 'a t -> 'a t
val update : key -> ('a option -> 'a option) -> 'a t -> 'a t
val singleton : key -> 'a -> 'a t
val remove : key -> 'a t -> 'a t
val merge :
(key -> 'a option -> 'b option -> 'c option) -> 'a t -> 'b t -> 'c t
val union : (key -> 'a -> 'a -> 'a option) -> 'a t -> 'a t -> 'a t
val compare : ('a -> 'a -> int) -> 'a t -> 'a t -> int
val equal : ('a -> 'a -> bool) -> 'a t -> 'a t -> bool
val iter : (key -> 'a -> unit) -> 'a t -> unit
val fold : (key -> 'a -> 'b -> 'b) -> 'a t -> 'b -> 'b
val for_all : (key -> 'a -> bool) -> 'a t -> bool
val exists : (key -> 'a -> bool) -> 'a t -> bool
val filter : (key -> 'a -> bool) -> 'a t -> 'a t
val partition : (key -> 'a -> bool) -> 'a t -> 'a t * 'a t
val cardinal : 'a t -> int
val bindings : 'a t -> (key * 'a) list
val min_binding : 'a t -> key * 'a
val min_binding_opt : 'a t -> (key * 'a) option
val max_binding : 'a t -> key * 'a
val max_binding_opt : 'a t -> (key * 'a) option
val choose : 'a t -> key * 'a
val choose_opt : 'a t -> (key * 'a) option
val split : key -> 'a t -> 'a t * 'a option * 'a t
val find : key -> 'a t -> 'a
val find_opt : key -> 'a t -> 'a option
val find_first : (key -> bool) -> 'a t -> key * 'a
val find_first_opt : (key -> bool) -> 'a t -> (key * 'a) option
val find_last : (key -> bool) -> 'a t -> key * 'a
val find_last_opt : (key -> bool) -> 'a t -> (key * 'a) option
val map : ('a -> 'b) -> 'a t -> 'b t
val mapi : (key -> 'a -> 'b) -> 'a t -> 'b t
val to_seq : 'a t -> (key * 'a) Seq.t
val to_seq_from : key -> 'a t -> (key * 'a) Seq.t
val add_seq : (key * 'a) Seq.t -> 'a t -> 'a t
val of_seq : (key * 'a) Seq.t -> 'a t
val filter_map : 'a t -> f:(key -> 'a -> 'b option) -> 'b t
val of_list : (key * 'a) list -> 'a t
val disjoint_union :
?eq:('a -> 'a -> bool) ->
?print:(Format.formatter -> 'a -> unit) -> 'a t -> 'a t -> 'a t
val union_right : 'a t -> 'a t -> 'a t
val union_left : 'a t -> 'a t -> 'a t
val union_merge : ('a -> 'a -> 'a) -> 'a t -> 'a t -> 'a t
val rename : key t -> key -> key
val map_keys : (key -> key) -> 'a t -> 'a t
val keys : 'a t -> Set.Make(T).t
val data : 'a t -> 'a list
val of_set : (key -> 'a) -> Set.Make(T).t -> 'a t
val transpose_keys_and_data : key t -> key t
val transpose_keys_and_data_set : key t -> Set.Make(T).t t
val print :
(Format.formatter -> 'a -> unit) -> Format.formatter -> 'a t -> unit
end`