.

                                     32
                             -      -   22       -
                         22       32   -         22
                       -              22                -
                     32             -                  32
                      -              32    ­              -
                     22         -       22            22
                      -           32     -               -
                       32            22              32
                         -              -                -
                           22         32          22
                              -          -        ­   -
                               32     22     32
                                          -