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      module type OrderedType  = sig type t val compare : t -> t -> int end
module type S  =
  sig
    type key
    type +!'a t
    val empty : 'a t
    val add : key -> 'a -> 'a t -> 'a t
    val add_to_list : key -> 'a -> 'a list t -> 'a list 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 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 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 iter : (key -> 'a -> unit) -> 'a t -> unit
    val fold : (key -> 'a -> 'acc -> 'acc) -> 'a t -> 'acc -> 'acc
    val map : ('a -> 'b) -> 'a t -> 'b t
    val mapi : (key -> 'a -> 'b) -> 'a t -> 'b t
    val filter : (key -> 'a -> bool) -> 'a t -> 'a t
    val filter_map : (key -> 'a -> 'b option) -> 'a t -> 'b t
    val partition : (key -> 'a -> bool) -> 'a t -> ('a t * 'a t)
    val split : key -> 'a t -> ('a t * 'a option * 'a t)
    val is_empty : 'a t -> bool
    val mem : key -> 'a t -> bool
    val equal : ('a -> 'a -> bool) -> 'a t -> 'a t -> bool
    val compare : ('a -> 'a -> int) -> 'a t -> 'a t -> int
    val for_all : (key -> 'a -> bool) -> 'a t -> bool
    val exists : (key -> 'a -> bool) -> 'a t -> bool
    val to_list : 'a t -> (key * 'a) list
    val of_list : (key * 'a) list -> 'a t
    val to_seq : 'a t -> (key * 'a) Seq.t
    val to_rev_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
  end
module Make :
functor (Ord : OrderedType) ->
  sig
    type key = Ord.t
    type +!'a t
    val empty : 'a t
    val add : key -> 'a -> 'a t -> 'a t
    val add_to_list : key -> 'a -> 'a list t -> 'a list 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 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 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 iter : (key -> 'a -> unit) -> 'a t -> unit
    val fold : (key -> 'a -> 'acc -> 'acc) -> 'a t -> 'acc -> 'acc
    val map : ('a -> 'b) -> 'a t -> 'b t
    val mapi : (key -> 'a -> 'b) -> 'a t -> 'b t
    val filter : (key -> 'a -> bool) -> 'a t -> 'a t
    val filter_map : (key -> 'a -> 'b option) -> 'a t -> 'b t
    val partition : (key -> 'a -> bool) -> 'a t -> ('a t * 'a t)
    val split : key -> 'a t -> ('a t * 'a option * 'a t)
    val is_empty : 'a t -> bool
    val mem : key -> 'a t -> bool
    val equal : ('a -> 'a -> bool) -> 'a t -> 'a t -> bool
    val compare : ('a -> 'a -> int) -> 'a t -> 'a t -> int
    val for_all : (key -> 'a -> bool) -> 'a t -> bool
    val exists : (key -> 'a -> bool) -> 'a t -> bool
    val to_list : 'a t -> (key * 'a) list
    val of_list : (key * 'a) list -> 'a t
    val to_seq : 'a t -> (key * 'a) Seq.t
    val to_rev_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
  end
 
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