{HEAD ~ A modularly stackable centrally ventilated bird house} that includes {TAIL ~ a main portion}, a ventilation system, and a base 
{ HEAD ~ A modularly stackable centrally ventilated bird house } that includes { TAIL ~ a main portion } , a ventilation system , and a base
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH