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    //
    // ********************************************************************
    // * License and Disclaimer                                           *
    // *                                                                  *
    // * The  Geant4 software  is  copyright of the Copyright Holders  of *
    // * the Geant4 Collaboration.  It is provided  under  the terms  and *
    // * conditions of the Geant4 Software License,  included in the file *
    // * LICENSE and available at  http://cern.ch/geant4/license .  These *
    // * include a list of copyright holders.                             *
    // *                                                                  *
    // * Neither the authors of this software system, nor their employing *
    // * institutes,nor the agencies providing financial support for this *
    // * work  make  any representation or  warranty, express or implied, *
    // * regarding  this  software system or assume any liability for its *
    // * use.  Please see the license in the file  LICENSE  and URL above *
    // * for the full disclaimer and the limitation of liability.         *
    // *                                                                  *
    // * This  code  implementation is the result of  the  scientific and *
    // * technical work of the GEANT4 collaboration.                      *
    // * By using,  copying,  modifying or  distributing the software (or *
    // * any work based  on the software)  you  agree  to acknowledge its *
    // * use  in  resulting  scientific  publications,  and indicate your *
    // * acceptance of all terms of the Geant4 Software license.          *
    // ********************************************************************
    //
    /// \file OpNovice/OpNovice.cc
    /// \brief Main program of the OpNovice example
    //
    //
    //
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    //
    // Description: Test of Continuous Process G4Cerenkov
    //              and RestDiscrete Process G4Scintillation
    //              -- Generation Cerenkov Photons --
    //              -- Generation Scintillation Photons --
    //              -- Transport of optical Photons --
    // Version:     5.0
    // Created:     1996-04-30
    // Author:      Juliet Armstrong
    // mail:        gum@triumf.ca
    //
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    #include "G4Types.hh"
    
    #ifdef G4MULTITHREADED
    #include "G4MTRunManager.hh"
    #else
    #include "G4RunManager.hh"
    #endif
    
    #include "G4UImanager.hh"
    
    #include "OpNovicePhysicsList.hh"
    #include "PhysicsList.hh"
    #include "OpNoviceDetectorConstruction.hh"
    
    #include "OpNoviceActionInitialization.hh"
    
    #include "G4VisExecutive.hh"
    #include "G4UIExecutive.hh"
    
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    namespace {
      void PrintUsage() {
        G4cerr << " Usage: " << G4endl;
        G4cerr << " OpNovice [-m macro ] [-u UIsession] [-t nThreads] [-r seed] "
               << G4endl;
        G4cerr << "   note: -t option is available only for multi-threaded mode."
               << G4endl;
      }
    }
    
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    int main(int argc,char** argv)
    {
      // Evaluate arguments
      //
      if ( argc > 9 ) {
        PrintUsage();
        return 1;
      }
    
      G4String macro;
      G4String session;
    #ifdef G4MULTITHREADED
      G4int nThreads = 0;
    #endif
    
      G4long myseed = 345354;
      for ( G4int i=1; i<argc; i=i+2 ) {
         if      ( G4String(argv[i]) == "-m" ) macro   = argv[i+1];
         else if ( G4String(argv[i]) == "-u" ) session = argv[i+1];
         else if ( G4String(argv[i]) == "-r" ) myseed  = atoi(argv[i+1]);
    #ifdef G4MULTITHREADED
         else if ( G4String(argv[i]) == "-t" ) {
                        nThreads = G4UIcommand::ConvertToInt(argv[i+1]);
        }
    #endif
        else {
          PrintUsage();
          return 1;
        }
      }
    
      // Instantiate G4UIExecutive if interactive mode
      G4UIExecutive* ui = nullptr;
      if ( macro.size() == 0 ) {
        ui = new G4UIExecutive(argc, argv);
      }
    
      // Choose the Random engine
      //
      G4Random::setTheEngine(new CLHEP::RanecuEngine);
    
      // Construct the default run manager
      //
    #ifdef G4MULTITHREADED
      G4MTRunManager * runManager = new G4MTRunManager;
      if ( nThreads > 0 ) runManager->SetNumberOfThreads(nThreads);
    #else
      G4RunManager * runManager = new G4RunManager;
    #endif
    
      // Seed the random number generator manually
      G4Random::setTheSeed(myseed);
    
      // Set mandatory initialization classes
      //
      // Detector construction
      runManager-> SetUserInitialization(new OpNoviceDetectorConstruction());
      // Physics list
      runManager-> SetUserInitialization(new OpNovicePhysicsList());
      // User action initialization
      runManager->SetUserInitialization(new OpNoviceActionInitialization());
    
      // Initialize G4 kernel
      //
      runManager->Initialize();
    
      // Initialize visualization
      //
      G4VisManager* visManager = new G4VisExecutive;
      // G4VisExecutive can take a verbosity argument - see /vis/verbose guidance.
      // G4VisManager* visManager = new G4VisExecutive("Quiet");
      visManager->Initialize();
    
      // Get the pointer to the User Interface manager
      //
      G4UImanager* UImanager = G4UImanager::GetUIpointer();
    
      if ( macro.size() ) {
         // Batch mode
         G4String command = "/control/execute ";
         UImanager->ApplyCommand(command+macro);
      }
      else // Define UI session for interactive mode
      {
         UImanager->ApplyCommand("/control/execute vis.mac");
         if (ui->IsGUI())
            UImanager->ApplyCommand("/control/execute gui.mac");
         ui->SessionStart();
         delete ui;
      }
    
      // Job termination
      // Free the store: user actions, physics_list and detector_description are
      //                 owned and deleted by the run manager, so they should not
      //                 be deleted in the main() program !
    
      delete visManager;
      delete runManager;
    
      return 0;
    }
    
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