+------------------+
      +----------->       PCE        <----------+
      |           +--------^---------+          |
      |                    |                    |
      |             PCInitiate/PCRpt            |
      |                    |                    |
      |               +----v--+                 |
      +---------------+ R3(RR)+-----------------+
      |               +-------+                 |
PCInitiate/PCRpt                         PCInitiate/PCRpt
      |                                         |
     +v-+          +--+          +--+         +-v+
     |R1+----------+R5+----------+R6+---------+R7|
     ++-+          +-++          +--+         +-++
      |              |                          |
      |            +--+          +--+           |
      +------------+R2+----------+R4+-----------+
                   +--+          +--+