.

                                     C
                           u      u   s       u
                        s          t    o          s
                      t               m              t
                     o               e                 o
                    m               r                 m
                    e                C                  e
                    r             u       s             r
                     C            t       o            C
                      u            m   e            u
                       s               r               s
                         t             C             t
                           o          u           o
                             m       s        m
                                e      t       e
                                   r   o   r
                                        m
                                         e
                                         r