{HEAD ~ The extension} has {TAIL ~ an inner diameter} less than the inner diameter of the remainder of the annular protrusion 
has
{ HEAD ~ The extension } has { TAIL ~ an inner diameter } less than the inner diameter of the remainder of the annular protrusion
HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH