{TAIL ~ Productivity} increases of {HEAD ~ 15 percent} and often more can be achieved at relatively low expense 
{ TAIL ~ Productivity } increases of { HEAD ~ 15 percent } and often more can be achieved at relatively low expense
TAIL TAIL TAIL TAIL TAIL OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH