val mem : elt -> t -> bool
val remove : elt -> t -> t
val disjoint : t -> t -> bool
val compare : t -> t -> int
val equal : t -> t -> bool
val subset : t -> t -> bool
val iter : (elt -> unit) -> t -> unit
val fold : (elt -> 'a -> 'a) -> t -> 'a -> 'a
val for_all : (elt -> bool) -> t -> bool
val exists : (elt -> bool) -> t -> bool
val filter : (elt -> bool) -> t -> t
val partition : (elt -> bool) -> t -> t * t
val elements : t -> elt list
val min_elt_opt : t -> elt option
val max_elt_opt : t -> elt option
val choose_opt : t -> elt option
val find_opt : elt -> t -> elt option
val of_list : elt list -> t
val of_increasing_iterator_unchecked : (unit -> elt) -> int -> t
val of_sorted_array_unchecked : elt array -> t
val find_first_opt : (elt -> bool) -> t -> elt option