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-(************************************************************************)
-(*  v      *   The Coq Proof Assistant  /  The Coq Development Team     *)
-(* <O___,, *   INRIA - CNRS - LIX - LRI - PPS - Copyright 1999-2017     *)
-(*   \VV/  **************************************************************)
-(*    //   *      This file is distributed under the terms of the       *)
-(*         *       GNU Lesser General Public License Version 2.1        *)
-(************************************************************************)
-
-(** * Purely functional, double-ended queues *)
-
-(** This module implements the banker's deque, from Okasaki. Most operations are
-    amortized O(1). *)
-
-type +'a t
-
-exception Empty
-
-(** {5 Constructor} *)
-
-val empty : 'a t
-
-(** The empty deque. *)
-
-(** {5 Left-side operations} *)
-
-val lcons : 'a -> 'a t -> 'a t
-(** Pushes an element on the left side of the deque. *)
-
-val lhd : 'a t -> 'a
-(** Returns the leftmost element in the deque. Raises [Empty] when empty. *)
-
-val ltl : 'a t -> 'a t
-(** Returns the left-tail of the deque. Raises [Empty] when empty. *)
-
-(** {5 Right-side operations} *)
-
-val rcons : 'a -> 'a t -> 'a t
-(** Same as [lcons] but on the right side. *)
-
-val rhd : 'a t -> 'a
-(** Same as [lhd] but on the right side. *)
-
-val rtl : 'a t -> 'a t
-(** Same as [ltl] but on the right side. *)
-
-(** {5 Operations} *)
-
-val rev : 'a t -> 'a t
-(** Reverse deque. *)
-
-val length : 'a t -> int
-(** Length of a deque. *)
-
-val is_empty : 'a t -> bool
-(** Emptyness of a deque. *)
-
-val filter : ('a -> bool) -> 'a t -> 'a t
-(** Filters the deque *)