module Relation:sig
..end
type('a, 'b)
t =('a, 'b) Biocaml_accu.relation
val create : ?n:int -> unit -> ('a, 'b) t
val add : ('a, 'b) t -> 'a -> 'b -> unit
val stream : ('a, 'b) Biocaml_accu.relation -> ('a * 'b list) Stream.t
val of_stream : ('a * 'b) Stream.t -> ('a, 'b) Biocaml_accu.relation