{HEAD ~ The end conical portion} has {TAIL ~ a cone half angle} of from about 5 to about 10 degrees 
has
{ HEAD ~ The end conical portion } has { TAIL ~ a cone half angle } of from about 5 to about 10 degrees
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH