set -> unit
	val map :            (item -> item) -> set -> set
	val mapPartial :     (item -> item option) -> set -> set
	val fold :           (item * 'a -> 'a) -> 'a -> set -> 'a
	val all :            (item -> bool) -> set -> bool
	val exists :         (item -> bool) -> set -> bool
	val find :           (item -> bool) -> set -> item option
	val filter :         (item -> bool) -> set -> set
	val partition :      (item -> bool) -> set -> set * set
    end
  </PRE>

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