Matched context for ingress and back-flow

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

Share - ingress	Share - back-flow	Phrase
12.93%	27.51%	prevent {ingress or back-flow} [perform operation]
2.75%	9.86%	fluid {ingress or back-flow}
2.47%	7.24%	oil {ingress or back-flow}
2.48%	6.55%	fuel {ingress or back-flow}
3.42%	4.08%	air {ingress or back-flow}