Area 44 of top 16 includes a central aperture {HEAD ~ 44a} which is defined by {TAIL ~ smaller circular central portion 44b} 
Area 44 of top 16 includes a central aperture { HEAD ~ 44a } which is defined by { TAIL ~ smaller circular central portion 44b }
OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL