.

                                     H
                             a     a   p      a
                          p        p   y         p
                        p             H              p
                      y               a                 y
                     H               p                  H
                     a                p                   a
                     p                y                   p
                      p           H      a              p
                      y            p      p              y
                       H           y     H           H
                          a           a  p           a
                               p        p        p
                                         Y