{TAIL ~ a first step} extending above the top surface of {HEAD ~ said housing} and positioned adjacent to said passage 
{ TAIL ~ a first step } extending above the top surface of { HEAD ~ said housing } and positioned adjacent to said passage
TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH