 
                                                 
                                                 18
                            
                                        18              
                            
                            
                     
                                                 1
                            
                                        1               
                            
                            
                     
                                                 1
                            
                                        1               
                            
                            
                     
                                                 19              
                            
                                        3D ture
                            
                                        19              
                            
                                        3D ture
                            
                    