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