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