K2.MakeSeededmodule H1 : Hashtbl.SeededHashedTypemodule H2 : Hashtbl.SeededHashedTypeval create : ?random:bool -> int -> 'a tval clear : 'a t -> unitval reset : 'a t -> unitval length : 'a t -> intval stats : 'a t -> Hashtbl.statisticsval clean : 'a t -> unitval stats_alive : 'a t -> Hashtbl.statistics