.
                                   S
                             t    t u    t
                           u     p i      u
                          p       d         p
                          i      S    t       i
                          d     u   p      d
                           S     i   d      S
                            t      S t       t
                             u     u      u
                                 p      p
                                     i
                                     d

.
                                     P
                               a   a p   a
                             p     e r     p
                            e       P         e
                            r     a   p       r
                            P    e     r      P
                             a    P   a     a
                              p    p e     p
                                e    r     e
                                    r • r

.
                             Paper
                        Paper Paper
                      Paper Paper Pa
                     per Paper Paper
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                        Paper Paper
                        Paper Paper
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                Paper                Paper
           Paper Paper     Paper Paper
       Paper Paper Pa  per Paper Paper
         Paper Paper        Paper Paper
              Paper                     Paper

.
                                  B
                          e     e a      e
                        a       v e        a
                       v          r           v
                       e        B  e          e
                       r        a    v         r
                       B       e     r        B
                        e       B    e       e
                          a       a v       a
                            v       e       v
                                e    •     e
                                     R

.
                                   C
                             o   om   o
                           m    p l      m
                          p      e x        p
                         l          C           l
                         e       o   m       e
                          x      p    l       x
                           C     e   x      C
                               o    C    o
                                     o

.
                          simple s
                      imple simple
                    simple   simple
                   simple  simple  s
                      simple simple  
                      simple simple
                      simple simple
                      simple simple
                      simple simple
                      simple simple
                      simple simple
                      simple simple
                      simple simple
                      simple simple
                      simple simple
                      simple simple
                      simple simple
          simple simple     simple simple
       simple simple si  mple  simple   si
      simple simple  s   imple simple sim
       simple simple        simple simple
             simple                      simple

.
                                  C
                            h    ha    h
                          a      me     a
                         m      le        m
                         e     o     n      e
                          l     C     h       l
                           e    a   m     e
                            o    e   o     o
                               n   n    n
                                     C