 14
                            
                                        14              
                            
                            
                     
                                                 20              
                            
                                        3D ture
                            
                                        20              
                            
                                        3D ture
                            
                     
                                                 15
                            
                                        15              
                            
                            
                     
                                                 6
                            
                                        6               
                            
                            
                    