The distorting is preferably either based upon a particular stylistic form or upon {HEAD ~ a set} of {TAIL ~ personal preferences} 
of
The distorting is preferably either based upon a particular stylistic form or upon { HEAD ~ a set } of { TAIL ~ personal preferences }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL