.

                                                                               .                  .

                            .                                           .                      

                                                                                                           .

    o
                                                       .          

                                                                         .

                                                                                                                               .

                    .                                                                           .

           .          .                                                                                                                                 .

                                    .                                                                                                                 .

                                     

                                                                                       .

 ..                    

                                                    .
                                                                                □