The upper inside surface and the lower inside surface of the housing define a group of slots and a rear wall of the housing defines {HEAD ~ a plurality} of {TAIL ~ openings} 
of
The upper inside surface and the lower inside surface of the housing define a group of slots and a rear wall of the housing defines { HEAD ~ a plurality } of { TAIL ~ openings }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL