The main portion includes a lowermost floor, corner posts, lower peripheral perches, {HEAD ~ a pair} of {TAIL ~ lower internal perches}, an uppermost floor, upper peripheral perches, a pair of upper internal perches, and a ceiling 
of
The main portion includes a lowermost floor , corner posts , lower peripheral perches , { HEAD ~ a pair } of { TAIL ~ lower internal perches } , an uppermost floor , upper peripheral perches , a pair of upper internal perches , and a ceiling
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 TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH