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