Concordance for adjective clean

The page lists top contexts for adjective clean and their percentages (as applied to automotive subject domain).

Share	Phrase
11.71%	clean [age] air
7.30%	clean [age] gas
6.25%	clean [age] fuel
5.33%	clean [age] combustion
5.19%	clean [age] isolation
5.05%	clean [age] fireplace
4.96%	clean [age] oil
4.49%	clean [age] side
4.35%	clean [age] keep
3.22%	clean [age] environment
2.52%	clean [age] burning
2.38%	clean [age] act
1.78%	clean [age] system
1.68%	clean [age] test
1.56%	clean [age] condition
1.40%	clean [age] diesel
1.40%	clean [age] distillate
1.40%	clean [age] outlet
1.40%	clean [age] plenum
1.40%	clean [age] room
1.40%	clean [age] surface
1.33%	clean [age] plug
1.21%	clean [age] fluid
1.21%	clean [age] supply
1.09%	clean [age] element
1.00%	clean [age] engine
0.98%	clean [age] exhaust
0.98%	clean [age] maintain
0.98%	clean [age] represent
0.97%	clean [age] apparatus
0.97%	clean [age] injector
0.94%	clean to environment
0.85%	clean [age] chamber
0.85%	clean [age] flow
0.84%	clean [age] amendment
0.84%	clean [age] burn
0.84%	clean [age] change
0.84%	clean [age] post-etch
0.84%	post-etch [attribute] clean
0.78%	clean [age] mixture
0.73%	clean [age] process
0.73%	clean [age] remain
0.73%	clean [age] stream
0.73%	clean [age] water
0.64%	relatively clean
0.62%	change [attribute] clean
0.59%	clean with solution
0.23%	relatively [degree] clean
0.17%	only [degree] clean
0.13%	substantially [degree] clean