Pathway 88 is defined by upper surface 90 of stop 72 and {HEAD ~ a parallel wall section} 92 beneath {TAIL ~ cover plate} 78 
beneath
Pathway 88 is defined by upper surface 90 of stop 72 and { HEAD ~ a parallel wall section } 92 beneath { TAIL ~ cover plate } 78
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH REL TAIL TAIL TAIL TAIL TAIL TAIL OTH