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(* $Id$ *)
(* Bijections. *)
type ('a,'b) t
val empty : ('a,'b) t
val map : ('a,'b) t -> 'a -> 'b
val pam : ('a,'b) t -> 'b -> 'a
val dom : ('a,'b) t -> 'a list
val rng : ('a,'b) t -> 'b list
val in_dom : ('a,'b) t -> 'a -> bool
val in_rng : ('a,'b) t -> 'b -> bool
val app : ('a -> 'b -> unit) -> ('a,'b) t -> unit
val to_list : ('a,'b) t -> ('a * 'b) list
val add : ('a,'b) t -> 'a * 'b -> ('a,'b) t
val remove : ('a,'b) t -> 'a -> ('a,'b) t
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