"efficient" - key terms from Wikipedia

clock cycle efficient
efficient
efficient	and prompt handling
efficient	cause
efficient	energy use
efficient	filtration
efficient	frontier
efficient	market
efficient	market hypothesis
efficient	than
energy efficient
energy efficient	northbridge design
fuel efficient
less efficient
more efficient
more efficient	than class
more energy efficient
more fuel efficient	vehicles
most efficient
most efficient	shape
pareto efficient
power efficient
space efficient