{HEAD ~ Floor} 44 is formed with steps 46 at an interior edge of opening 45 on which a plate 48 rests, the opening being covered by {TAIL ~ the plate} 
{ HEAD ~ Floor } 44 is formed with steps 46 at an interior edge of opening 45 on which a plate 48 rests , the opening being covered by { TAIL ~ the plate }
HEAD HEAD HEAD HEAD HEAD 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 TAIL TAIL TAIL TAIL TAIL TAIL