sig
val stats : bool Pervasives.ref
type input_format = I_tptp | I_zf | I_guess
val input_format_of_string : string -> Options.input_format
type print_format = Print_none | Print_normal | Print_tptp | Print_zf
val print_format_of_string : string -> Options.print_format
val input : Options.input_format Pervasives.ref
val output : Options.print_format Pervasives.ref
val switch_opt : 'a -> ('a -> unit) -> Arg.spec
val switch_set : 'a -> 'a Pervasives.ref -> Arg.spec
val add_opt : string * Arg.spec * string -> unit
val add_opts : (string * Arg.spec * string) list -> unit
val make : unit -> (string * Arg.spec * string) list
end