the convex edge is adjacent to {HEAD ~ the open top end} of {TAIL ~ the plastic foam conical body}, 
of
the convex edge is adjacent to { HEAD ~ the open top end } of { TAIL ~ the plastic foam conical body } ,
OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH