src/HOL/Tools/ATP_Manager/atp_systems.ML
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(*  Title:      HOL/Tools/ATP_Manager/atp_systems.ML
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    Author:     Fabian Immler, TU Muenchen
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    Author:     Jasmin Blanchette, TU Muenchen
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Setup for supported ATPs.
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*)
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signature ATP_SYSTEMS =
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sig
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  type prover = ATP_Manager.prover
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  (* hooks for problem files *)
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  val dest_dir : string Config.T
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  val problem_prefix : string Config.T
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  val measure_runtime : bool Config.T
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  val refresh_systems_on_tptp : unit -> unit
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  val default_atps_param_value : unit -> string
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  val setup : theory -> theory
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end;
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structure ATP_Systems : ATP_SYSTEMS =
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struct
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open Sledgehammer_Util
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open Sledgehammer_Fact_Preprocessor
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open Sledgehammer_HOL_Clause
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open Sledgehammer_Fact_Filter
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open Sledgehammer_Proof_Reconstruct
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open ATP_Manager
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(** generic ATP **)
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(* external problem files *)
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val (dest_dir, dest_dir_setup) = Attrib.config_string "atp_dest_dir" (K "");
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  (*Empty string means create files in Isabelle's temporary files directory.*)
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val (problem_prefix, problem_prefix_setup) =
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  Attrib.config_string "atp_problem_prefix" (K "prob");
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val (measure_runtime, measure_runtime_setup) =
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  Attrib.config_bool "atp_measure_runtime" (K false);
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(* prover configuration *)
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type prover_config =
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  {home: string,
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   executable: string,
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   arguments: Time.time -> string,
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   proof_delims: (string * string) list,
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   known_failures: (failure * string) list,
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   max_axiom_clauses: int,
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   prefers_theory_relevant: bool};
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(* basic template *)
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val remotify = prefix "remote_"
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fun with_path cleanup after f path =
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  Exn.capture f path
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  |> tap (fn _ => cleanup path)
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  |> Exn.release
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  |> tap (after path)
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(* Splits by the first possible of a list of delimiters. *)
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fun extract_proof delims output =
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  case pairself (find_first (fn s => String.isSubstring s output))
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                (ListPair.unzip delims) of
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    (SOME begin_delim, SOME end_delim) =>
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    output |> first_field begin_delim |> the |> snd
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           |> first_field end_delim |> the |> fst
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  | _ => ""
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fun extract_proof_and_outcome res_code proof_delims known_failures output =
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  case map_filter (fn (failure, pattern) =>
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                      if String.isSubstring pattern output then SOME failure
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                      else NONE) known_failures of
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    [] => (case extract_proof proof_delims output of
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             "" => ("", SOME UnknownError)
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           | proof => if res_code = 0 then (proof, NONE)
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                      else ("", SOME UnknownError))
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  | (failure :: _) => ("", SOME failure)
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fun string_for_failure Unprovable = "The ATP problem is unprovable."
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  | string_for_failure TimedOut = "Timed out."
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  | string_for_failure OutOfResources = "The ATP ran out of resources."
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  | string_for_failure OldSpass =
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    "Warning: Sledgehammer requires a more recent version of SPASS with \
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    \support for the TPTP syntax. To install it, download and untar the \
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    \package \"http://isabelle.in.tum.de/~blanchet/spass-3.7.tgz\" and add the \
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    \\"spass-3.7\" directory's full path to \"" ^
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    Path.implode (Path.expand (Path.appends
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        (Path.variable "ISABELLE_HOME_USER" ::
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         map Path.basic ["etc", "components"]))) ^
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    "\" on a line of its own."
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  | string_for_failure MalformedOutput = "Error: The ATP output is malformed."
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  | string_for_failure UnknownError = "Error: An unknown ATP error occurred."
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fun generic_prover overlord get_facts prepare write_file home executable args
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        proof_delims known_failures name
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        ({debug, full_types, explicit_apply, isar_proof, modulus, sorts, ...}
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         : params) minimize_command
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        ({subgoal, goal, relevance_override, axiom_clauses, filtered_clauses}
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         : problem) =
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  let
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    (* get clauses and prepare them for writing *)
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    val (ctxt, (chain_ths, th)) = goal;
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    val thy = ProofContext.theory_of ctxt;
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    val chain_ths = map (Thm.put_name_hint chained_hint) chain_ths;
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    val goal_cls = #1 (neg_conjecture_clauses ctxt th subgoal);
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    val the_filtered_clauses =
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      (case filtered_clauses of
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        NONE => get_facts relevance_override goal goal_cls
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      | SOME fcls => fcls);
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    val the_axiom_clauses =
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      (case axiom_clauses of
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        NONE => the_filtered_clauses
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      | SOME axcls => axcls);
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    val (internal_thm_names, clauses) =
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      prepare goal_cls chain_ths the_axiom_clauses the_filtered_clauses thy;
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    (* path to unique problem file *)
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    val the_dest_dir = if overlord then getenv "ISABELLE_HOME_USER"
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                       else Config.get ctxt dest_dir;
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    val the_problem_prefix = Config.get ctxt problem_prefix;
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    fun prob_pathname nr =
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      let
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        val probfile =
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          Path.basic (the_problem_prefix ^
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                      (if overlord then "_" ^ name else serial_string ())
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                      ^ "_" ^ string_of_int nr)
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      in
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        if the_dest_dir = "" then File.tmp_path probfile
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        else if File.exists (Path.explode the_dest_dir)
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        then Path.append (Path.explode the_dest_dir) probfile
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        else error ("No such directory: " ^ the_dest_dir ^ ".")
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      end;
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    val command = Path.explode (home ^ "/" ^ executable)
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    (* write out problem file and call prover *)
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    fun command_line probfile =
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      (if Config.get ctxt measure_runtime then
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         "TIMEFORMAT='%3U'; { time " ^
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         space_implode " " [File.shell_path command, args,
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                            File.shell_path probfile] ^ " ; } 2>&1"
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       else
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         space_implode " " ["exec", File.shell_path command, args,
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                            File.shell_path probfile, "2>&1"]) ^
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      (if overlord then
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         " | sed 's/,/, /g' \
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         \| sed 's/\\([^!=]\\)\\([=|]\\)\\([^=]\\)/\\1 \\2 \\3/g' \
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         \| sed 's/! =/ !=/g' \
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         \| sed 's/  / /g' | sed 's/| |/||/g' \
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         \| sed 's/ = = =/===/g' \
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         \| sed 's/= = /== /g'"
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       else
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         "")
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    fun split_time s =
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      let
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        val split = String.tokens (fn c => str c = "\n");
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        val (output, t) = s |> split |> split_last |> apfst cat_lines;
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        fun as_num f = f >> (fst o read_int);
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        val num = as_num (Scan.many1 Symbol.is_ascii_digit);
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        val digit = Scan.one Symbol.is_ascii_digit;
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        val num3 = as_num (digit ::: digit ::: (digit >> single));
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        val time = num --| Scan.$$ "." -- num3 >> (fn (a, b) => a * 1000 + b);
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        val as_time = the_default 0 o Scan.read Symbol.stopper time o explode;
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      in (output, as_time t) end;
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    fun split_time' s =
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      if Config.get ctxt measure_runtime then split_time s else (s, 0)
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    fun run_on probfile =
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      if File.exists command then
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        write_file full_types explicit_apply probfile clauses
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        |> pair (apfst split_time' (bash_output (command_line probfile)))
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      else
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        error ("Bad executable: " ^ Path.implode command ^ ".");
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    (* If the problem file has not been exported, remove it; otherwise, export
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       the proof file too. *)
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    fun cleanup probfile =
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      if the_dest_dir = "" then try File.rm probfile else NONE
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    fun export probfile (((output, _), _), _) =
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      if the_dest_dir = "" then
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        ()
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      else
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        File.write (Path.explode (Path.implode probfile ^ "_proof"))
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                   ((if overlord then
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                       "% " ^ command_line probfile ^ "\n% " ^ timestamp () ^
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                       "\n"
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                     else
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                        "") ^ output)
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    val (((output, atp_run_time_in_msecs), res_code), _) =
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      with_path cleanup export run_on (prob_pathname subgoal);
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    (* Check for success and print out some information on failure. *)
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    val (proof, outcome) =
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      extract_proof_and_outcome res_code proof_delims known_failures output
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    val (message, relevant_thm_names) =
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      case outcome of
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        NONE => proof_text isar_proof debug modulus sorts ctxt
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                           (minimize_command, proof, internal_thm_names, th,
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                            subgoal)
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      | SOME failure => (string_for_failure failure ^ "\n", [])
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  in
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    {outcome = outcome, message = message,
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     relevant_thm_names = relevant_thm_names,
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     atp_run_time_in_msecs = atp_run_time_in_msecs, output = output,
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     proof = proof, internal_thm_names = internal_thm_names,
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     filtered_clauses = the_filtered_clauses}
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  end;
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(* generic TPTP-based provers *)
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fun generic_tptp_prover
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        (name, {home, executable, arguments, proof_delims, known_failures,
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                max_axiom_clauses, prefers_theory_relevant})
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        (params as {debug, overlord, respect_no_atp, relevance_threshold,
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                    convergence, theory_relevant, higher_order, follow_defs,
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                    isar_proof, ...})
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        minimize_command timeout =
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  generic_prover overlord
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      (get_relevant_facts respect_no_atp relevance_threshold convergence
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                          higher_order follow_defs max_axiom_clauses
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                          (the_default prefers_theory_relevant theory_relevant))
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      (prepare_clauses higher_order false)
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      (write_tptp_file (debug andalso overlord andalso not isar_proof)) home
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      executable (arguments timeout) proof_delims known_failures name params
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      minimize_command
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fun tptp_prover name p = (name, generic_tptp_prover (name, p));
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(** common provers **)
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fun to_generous_secs time = (Time.toMilliseconds time + 999) div 1000
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(* Vampire *)
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(* Vampire requires an explicit time limit. *)
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val vampire_config : prover_config =
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  {home = getenv "VAMPIRE_HOME",
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   executable = "vampire",
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   arguments = fn timeout =>
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     "--output_syntax tptp --mode casc -t " ^
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     string_of_int (to_generous_secs timeout),
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   proof_delims = [("=========== Refutation ==========",
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                    "======= End of refutation =======")],
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   known_failures =
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     [(Unprovable, "Satisfiability detected"),
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      (OutOfResources, "CANNOT PROVE"),
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      (OutOfResources, "Refutation not found")],
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   max_axiom_clauses = 60,
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   prefers_theory_relevant = false}
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val vampire = tptp_prover "vampire" vampire_config
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(* E prover *)
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val tstp_proof_delims =
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  ("# SZS output start CNFRefutation.", "# SZS output end CNFRefutation")
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val e_config : prover_config =
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  {home = getenv "E_HOME",
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   executable = "eproof",
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   arguments = fn timeout =>
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     "--tstp-in --tstp-out -l5 -xAutoDev -tAutoDev --silent --cpu-limit=" ^
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     string_of_int (to_generous_secs timeout),
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   proof_delims = [tstp_proof_delims],
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   known_failures =
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     [(Unprovable, "SZS status: Satisfiable"),
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      (Unprovable, "SZS status Satisfiable"),
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      (TimedOut, "Failure: Resource limit exceeded (time)"),
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      (TimedOut, "time limit exceeded"),
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      (OutOfResources,
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       "# Cannot determine problem status within resource limit"),
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      (OutOfResources, "SZS status: ResourceOut"),
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      (OutOfResources, "SZS status ResourceOut")],
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   max_axiom_clauses = 100,
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   prefers_theory_relevant = false}
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val e = tptp_prover "e" e_config
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(* SPASS *)
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fun generic_dfg_prover
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        (name, {home, executable, arguments, proof_delims, known_failures,
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                max_axiom_clauses, prefers_theory_relevant})
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        (params as {overlord, respect_no_atp, relevance_threshold, convergence,
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                    theory_relevant, higher_order, follow_defs, ...})
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        minimize_command timeout =
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  generic_prover overlord
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      (get_relevant_facts respect_no_atp relevance_threshold convergence
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                          higher_order follow_defs max_axiom_clauses
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                          (the_default prefers_theory_relevant theory_relevant))
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      (prepare_clauses higher_order true) write_dfg_file home executable
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      (arguments timeout) proof_delims known_failures name params
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      minimize_command
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fun dfg_prover name p = (name, generic_dfg_prover (name, p))
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(* The "-VarWeight=3" option helps the higher-order problems, probably by
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   counteracting the presence of "hAPP". *)
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val spass_config : prover_config =
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  {home = getenv "SPASS_HOME",
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   executable = "SPASS",
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   arguments = fn timeout =>
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     "-Auto -SOS=1 -PGiven=0 -PProblem=0 -Splits=0 -FullRed=0 -DocProof \
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     \-VarWeight=3 -TimeLimit=" ^ string_of_int (to_generous_secs timeout),
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   proof_delims = [("Here is a proof", "Formulae used in the proof")],
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   known_failures =
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     [(Unprovable, "SPASS beiseite: Completion found"),
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      (TimedOut, "SPASS beiseite: Ran out of time"),
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      (OutOfResources, "SPASS beiseite: Maximal number of loops exceeded")],
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   max_axiom_clauses = 40,
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   prefers_theory_relevant = true}
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val spass = dfg_prover "spass" spass_config
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(* SPASS 3.7 supports both the DFG and the TPTP syntax, whereas SPASS 3.0
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   supports only the DFG syntax. As soon as all Isabelle repository/snapshot
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   users have upgraded to 3.7, we can kill "spass" (and all DFG support in
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   Sledgehammer) and rename "spass_tptp" "spass". *)
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(* FIXME: Change the error message below to point to the Isabelle download
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   page once the package is there (around the Isabelle2010 release). *)
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val spass_tptp_config =
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  {home = #home spass_config,
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   executable = #executable spass_config,
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   arguments = prefix "-TPTP " o #arguments spass_config,
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   proof_delims = #proof_delims spass_config,
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   known_failures =
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     #known_failures spass_config @
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     [(OldSpass, "unrecognized option `-TPTP'"),
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      (OldSpass, "Unrecognized option TPTP")],
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   max_axiom_clauses = #max_axiom_clauses spass_config,
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   prefers_theory_relevant = #prefers_theory_relevant spass_config}
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val spass_tptp = tptp_prover "spass_tptp" spass_tptp_config
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(* remote prover invocation via SystemOnTPTP *)
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val systems = Synchronized.var "atp_systems" ([]: string list);
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fun get_systems () =
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  case bash_output "\"$ISABELLE_ATP_MANAGER/SystemOnTPTP\" -w" of
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    (answer, 0) => split_lines answer
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  | (answer, _) =>
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    error ("Failed to get available systems at SystemOnTPTP:\n" ^ answer)
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fun refresh_systems_on_tptp () =
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  Synchronized.change systems (fn _ => get_systems ());
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fun get_system prefix = Synchronized.change_result systems (fn systems =>
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  (if null systems then get_systems () else systems)
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  |> `(find_first (String.isPrefix prefix)));
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fun the_system prefix =
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  (case get_system prefix of
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    NONE => error ("System " ^ quote prefix ^
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                   " not available at SystemOnTPTP.")
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  | SOME sys => sys);
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val remote_known_failures =
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  [(TimedOut, "says Timeout"),
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   (MalformedOutput, "Remote script could not extract proof")]
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fun remote_prover_config atp_prefix args
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        ({proof_delims, known_failures, max_axiom_clauses,
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          prefers_theory_relevant, ...} : prover_config) : prover_config =
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  {home = getenv "ISABELLE_ATP_MANAGER",
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   executable = "SystemOnTPTP",
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   arguments = fn timeout =>
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     args ^ " -t " ^ string_of_int (to_generous_secs timeout) ^ " -s " ^
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     the_system atp_prefix,
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   proof_delims = insert (op =) tstp_proof_delims proof_delims,
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   known_failures = remote_known_failures @ known_failures,
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   max_axiom_clauses = max_axiom_clauses,
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   prefers_theory_relevant = prefers_theory_relevant}
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val remote_vampire =
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  tptp_prover (remotify (fst vampire))
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              (remote_prover_config "Vampire---9" "" vampire_config)
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val remote_e =
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  tptp_prover (remotify (fst e))
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              (remote_prover_config "EP---" "" e_config)
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val remote_spass =
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  tptp_prover (remotify (fst spass))
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              (remote_prover_config "SPASS---" "-x" spass_config)
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   396
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fun maybe_remote (name, _) ({home, ...} : prover_config) =
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  name |> home = "" ? remotify
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   399
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fun default_atps_param_value () =
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  space_implode " " [maybe_remote e e_config, maybe_remote spass spass_config,
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                     remotify (fst vampire)]
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   403
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val provers =
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  [spass, spass_tptp, vampire, e, remote_vampire, remote_spass, remote_e]
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val prover_setup = fold add_prover provers
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val setup =
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  dest_dir_setup
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  #> problem_prefix_setup
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  #> measure_runtime_setup
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  #> prover_setup
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end;