.

                                     K
                              i     i   t      i
                          t         K  a         t
                        K            t               K
                      a             K                 a
                      t             i   t                t
                      K           K   a              K
                       i            t    K              i
                         t          i     t              t
                          K         K a           K
                             a         t          a
                                 t     K      t
                                        i
              ­                          t