In {HEAD ~ the case} of {TAIL ~ a nail}, the plug of filler material would be joined to the nail head 
of
In { HEAD ~ the case } of { TAIL ~ a nail } , the plug of filler material would be joined to the nail head
OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH