{HEAD ~ a distributed digital communication system} within {TAIL ~ each} of said slave and master subsystems, each including a supervisor processor, 
within
{ HEAD ~ a distributed digital communication system } within { TAIL ~ each } of said slave and master subsystems , each including a supervisor processor ,
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH