if(options.debug>=2)System.out.println(" version "+version);
  static private void readVersion(DataInputStream input_file, String trace_filename)  {    int local_version = Utilities.getIntFromDataInputStream(input_file);    if (version == -1) {      if(options.debug>=2)System.out.println(" local version "+version);      version = local_version;    } else if (version != local_version) {      System.out.println("***"+trace_filename+"'s version "+local_version+" != "+version+"!***");      System.exit(-1);    }    if(options.debug>=2)System.out.println(" version "+version);  }