Specifically, {HEAD ~ the receiving state table} defines the source of picture data which each receiving {TAIL ~ device} receives  
Specifically , { HEAD ~ the receiving state table } defines the source of picture data which each receiving { TAIL ~ device } receives
OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH