Matched context for admission and back-flow

The page lists matched contexts for admission and back-flow.

Share - admission	Share - back-flow	Phrase
3.90%	18.94%	{admission or back-flow} valve
6.54%	9.86%	fluid {admission or back-flow}
12.06%	4.08%	air {admission or back-flow}
6.38%	6.55%	fuel {admission or back-flow}
1.32%	27.51%	prevent {admission or back-flow} [perform operation]
2.20%	6.12%	gas {admission or back-flow}
0.73%	7.24%	oil {admission or back-flow}