.

                                    K
                            i      i  l      i
                         l         l  e        l
                       l            r             l
                      e            K              e
                     r              i                r
                     K          l      l            K
                     i           e       r           i
                      l           K    i            l
                       l              l             l
                         e           l           e
                             r       e       r
                                      r