12              11                                13       

                                                                                                                                                                                                       

                  2                  18                  6                                                                            17                4       24                22              10

            14                                 8

                       5                                              20                                                                                                     

15            19                                         9

                                                                   3                         23                                                     16                           7

                                                                                            1

                                                                                                                                                                                        21