Matched context for egress and back-flow

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

Share - egress	Share - back-flow	Phrase
6.43%	27.51%	prevent {egress or back-flow} [perform operation]
5.37%	9.86%	fluid {egress or back-flow}
4.48%	6.55%	fuel {egress or back-flow}
6.52%	4.08%	air {egress or back-flow}
4.00%	6.12%	gas {egress or back-flow}