The body is open at {HEAD ~ a first or top end} and closed at {TAIL ~ a second or bottom end} 
The body is open at { HEAD ~ a first or top end } and closed at { TAIL ~ a second or bottom end }
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL