.
                                   P
                              u  u s  u
                           s      s y      s
                         s        - c         s
                        y         a t          y
                       -             p             -
                      c             u              c
                     a              s                 a
                    t                s                   t
                   p                y                    p
                 u                 - c                    u
                s                  a    t ­                  s
               s                  w     h                  s
               y                e           r                y
                 -                e         h                 -
                 c                 a      v                 c
                    a                 e                 a
                           t           y           t
                                       o
                                       u
                                        b
                                        e
                                        e
                                        n
                                        ?