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