Thus, {HEAD ~ one aspect} of {TAIL ~ the invention} is a portable device having a main unit and a keyboard unit 
of
Thus , { HEAD ~ one aspect } of { TAIL ~ the invention } is a portable device having a main unit and a keyboard unit
OTH 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