 2               
                            
                                        3D ture
                            
                                        2               
                            
                                        3D ture
                            
                     
                                                 2
                            
                                        2               
                            
                            
                     
                                                 20              
                            
                                        3D ture
                            
                                        20              
                            
                                        3D ture
                            
                     
                                                 5               
                            
                                        3D ture
                            
                                        5               
                            
                                        3D ture
                            
                     
                                                 3
                            
                                        3               
                            
                            
                     
                                                 3
                            
                                        3               
                            
                            
                    