If yes, {HEAD ~ processing} continues at {TAIL ~ process block} 1140 where a connection is allowed 
continues at
If yes , { HEAD ~ processing } continues at { TAIL ~ process block } 1140 where a connection is allowed
OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH