In one embodiment, the display unit constitutes {HEAD ~ a part} of {TAIL ~ a portable electronic device} 
of
In one embodiment , the display unit constitutes { HEAD ~ a part } of { TAIL ~ a portable electronic device }
OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL