{TAIL ~ the second design element} comprises a groove recessed into the interior surface of {HEAD ~ the body} 
{ TAIL ~ the second design element } comprises a groove recessed into the interior surface of { HEAD ~ the body }
TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD