Matched context for backflow and back-flow

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

Share - backflow	Share - back-flow	Phrase
22.00%	27.51%	prevent {backflow or back-flow} [perform operation]
19.24%	9.23%	{backflow or back-flow} zone
6.36%	6.55%	fuel {backflow or back-flow}
2.10%	18.94%	{backflow or back-flow} valve
3.20%	9.86%	fluid {backflow or back-flow}
4.28%	6.12%	gas {backflow or back-flow}
1.08%	4.08%	air {backflow or back-flow}