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G4RunManager * runManager = new G4RunManager;
// Mandatory User Initialization
runManager->set_userInitialization(new MyDetectorConstruction);
// Optional User Initializations
runManager->set_userInitialization(new MyParticleList);
runManager->set_userInitialization(new MyProcessList);
runManager->set_userAction(new MyPrimaryGeneratorAction);
runManager->set_userAction(new MyRunAction);
runManager->set_userAction(new MyEventAction);
runManager->set_userAction(new MyStackingAction);
runManager->set_userAction(new MyTrackingAction);
runManager->set_userAction(new MySteppingAction);