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