A display control unit controls display of the data processed by {TAIL ~ data processing unit} on {HEAD ~ a display terminal} 
A display control unit controls display of the data processed by { TAIL ~ data processing unit } on { HEAD ~ a display terminal }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD