{HEAD ~ each footed portion} being defined in part by {TAIL ~ an upper surface} which diverges from said body portion 
defined by
{ HEAD ~ each footed portion } being defined in part by { TAIL ~ an upper surface } which diverges from said body portion
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH REL OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH