This ensures that corners of the insert and the recess will not interfere with {HEAD ~ the proper seating} of {TAIL ~ the insert} 
of
This ensures that corners of the insert and the recess will not interfere with { HEAD ~ the proper seating } of { TAIL ~ the insert }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL