11              
                            
                                        3D ture
                            
                    
                            
                                        7               
                            
                            
                    
                            
                                        8               
                            
                                        3D ture
                            
                    
                            
                                        13              
                            
                            
                    
                            
                                        6               
                            
                            
                    
                            
                                        13