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module type COMPARABLE = sig
  type t
  val eq: t -> t -> bool
  val neq: t -> t -> bool
  val lt: t -> t -> bool
  val le: t -> t -> bool
  val gt: t -> t -> bool
  val ge: t -> t -> bool
end

module Num: sig

  type t

  val of_num: Num.num -> t
  val nan: t

  val to_num: t -> Num.num

  val eq: t -> t -> bool
  val neq: t -> t -> bool
  val lt: t -> t -> bool
  val le: t -> t -> bool
  val gt: t -> t -> bool
  val ge: t -> t -> bool

  val add: t -> t -> t
  val sub: t -> t -> t
  val mult: t -> t -> t
  val div: t -> t -> t
  val pow: t -> t -> t

  val rnd: unit -> t

  val max: t -> t -> t
  val min: t -> t -> t

  val abs: t -> t
end

module Bool: sig
  type t = bool

  val true_ : bool
  val false_: bool 

  val eq: t -> t -> bool
  val neq: t -> t -> bool
  val lt: t -> t -> bool
  val le: t -> t -> bool
  val gt: t -> t -> bool
  val ge: t -> t -> bool

  val not: t -> t
  val and_: t -> t -> t
  val or_: t -> t -> t
end

module String: sig
  type t = UTF8.t
  val eq: t -> t -> bool
  val neq: t -> t -> bool
  val lt: t -> t -> bool
  val le: t -> t -> bool
  val gt: t -> t -> bool
  val ge: t -> t -> bool
end