{HEAD ~ Process} 400 may then proceed to {TAIL ~ oval} 460 to end a write process 
proceed to
{ HEAD ~ Process } 400 may then proceed to { TAIL ~ oval } 460 to end a write process
HEAD HEAD HEAD HEAD HEAD OTH OTH OTH REL REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH