{HEAD ~ The valve stem} has {TAIL ~ a first end}, a second end and a bore integrated within 
has
{ HEAD ~ The valve stem } has { TAIL ~ a first end } , a second end and a bore integrated within
HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH