abstract sclass Agent {
  Collection<AIConcept> concepts;  // input
  new LinkedHashSet<S> statements; // output
  int duplicates; // number of already known statements emitted

  abstract void impl();
  
  void emit(S s) {
    if (!isTruth(s) && statements.add(s))
      print("> " + s + " - " + conceptLanguageToEnglish(s));
    else ++duplicates;
  }
  
  void runLive(bool doIt) {
    concepts = aiConcepts();
    statements.clear();
    impl();
    print("Have " + n(statements, "statements") + " to add");
    if (doIt) {
      print("ADDING.");
      addTruth(statements);
    }
  }
  
  void doIt { runLive(true); }
  void testRun { runLive(false); }
}