 18
                            
                                        18              
                            
                            
                     
                                                 7
                            
                                        7               
                            
                            
                     
                                                 15
                            
                                        15              
                            
                            
                     
                                                 13
                            
                                        13              
                            
                            
                     
                                                 15              
                            
                                        3D ture
                            
                                        15              
                            
                                        3D ture
                            
                     
                                                 13
                            
                                        13              
                            
                            
                    