 20
                            
                                        20              
                            
                            
                     
                                                 20
                            
                                        20              
                            
                            
                     
                                                 17              
                            
                                        3D ture
                            
                                        17              
                            
                                        3D ture
                            
                     
                                                 10
                            
                                        10              
                            
                            
                     
                                                 
                                                 
                                                 
                                                 20              
                            
                                        3D ture
                            
                                        20              
                            
                                        3D ture
                            
                     
                                                 11
                            
                                        11              
                            
                            
                     
                                                 31
                            
                                        31              
                            
                            
                     
                                                 10
                            
                                        10              
                            
                            
                    