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