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