.

                                  L
                         i       ia      i
                      a         rL         a
                     r           i              r
                    L         a   r            L
                   i           L    i            i
                    a         a     r          a
                     r         L    i           r
                       L        a  r          L
                         i         L          i
                           a       i       a
                              r    a    r
                                    r