{HEAD ~ The projection} extends from {TAIL ~ a rim} of the hole and the hollow is in communication therewith 
extends from
{ HEAD ~ The projection } extends from { TAIL ~ a rim } of the hole and the hollow is in communication therewith
HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH