{TAIL ~ A production line} has {HEAD ~ a plurality} of working groups in which work operations are controlled by a sequential controller 
{ TAIL ~ A production line } has { HEAD ~ a plurality } of working groups in which work operations are controlled by a sequential controller
TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH