{HEAD ~ A retainer} 1 wherein {TAIL ~ said entering nose portion} has a rounded exterior surface and an inner enlargement 
wherein
{ HEAD ~ A retainer } 1 wherein { TAIL ~ said entering nose portion } has a rounded exterior surface and an inner enlargement
HEAD HEAD HEAD HEAD HEAD HEAD OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH