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