This permits projects to be planned and executed with {HEAD ~ the greatest degree} of {TAIL ~ planning accuracy} 
of
This permits projects to be planned and executed with { HEAD ~ the greatest degree } of { TAIL ~ planning accuracy }
OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL