{HEAD ~ Those gripping members} near the open end 2 of the housing are shorter in {TAIL ~ length} than those near the closed end 3 
{ HEAD ~ Those gripping members } near the open end 2 of the housing are shorter in { TAIL ~ length } than those near the closed end 3
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH REL REL REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH