{TAIL ~ The upper inside surface} and {HEAD ~ the lower inside surface} of the housing define a group of slots 
{ TAIL ~ The upper inside surface } and { HEAD ~ the lower inside surface } of the housing define a group of slots
TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH