{HEAD ~ A receptacle} has an interior end, an exterior end and {TAIL ~ a wall surface} 
has
{ HEAD ~ A receptacle } has an interior end , an exterior end and { TAIL ~ a wall surface }
HEAD HEAD HEAD HEAD HEAD HEAD REL OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL