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(************************************************************************)
(*  v      *   The Coq Proof Assistant  /  The Coq Development Team     *)
(* <O___,, *   INRIA - CNRS - LIX - LRI - PPS - Copyright 1999-2012     *)
(*   \VV/  **************************************************************)
(*    //   *      This file is distributed under the terms of the       *)
(*         *       GNU Lesser General Public License Version 2.1        *)
(************************************************************************)

(** Maps from ['a] to lists of ['b]. *)

type ('a,'b) t

val empty : ('a,'b) t
val mem :  'a -> ('a,'b) t -> bool
val iter : ('a -> 'b list -> unit) -> ('a,'b) t -> unit
val map : ('b list -> 'c list) -> ('a,'b) t -> ('a,'c) t
val fold : ('a -> 'b list -> 'c -> 'c) -> ('a,'b) t -> 'c -> 'c

val add : 'a -> 'b -> ('a,'b) t -> ('a,'b) t
val find : 'a -> ('a,'b) t -> 'b list
val remove : 'a -> 'b -> ('a,'b) t -> ('a,'b) t