9               
                            
                            
                    
                            
                                        16              
                            
                                        3D ture
                            
                    
                            
                                        18              
                            
                            
                    
                            
                                        13              
                            
                            
                    
                            
                                        14              
                            
                            
                    
                            
                                        7