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