 7
                            
                                        7               
                            
                            
                     
                                                 3
                            
                                        3               
                            
                            
                     
                                                 18              
                            
                                        3D ture
                            
                                        18              
                            
                                        3D ture
                            
                     
                                                 18              
                            
                                        3D ture
                            
                                        18              
                            
                                        3D ture
                            
                    