{TAIL ~ A cap} covers {HEAD ~ the open top} and has a recessed surface formed therein directed toward the open top 
{ TAIL ~ A cap } covers { HEAD ~ the open top } and has a recessed surface formed therein directed toward the open top
TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH