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