Matched context for backflow and escape

The page lists matched contexts for backflow and escape.

Share - backflow	Share - escape	Phrase
22.00%	12.57%	prevent {backflow or escape} [perform operation]
6.36%	2.93%	fuel {backflow or escape}
4.28%	4.17%	gas {backflow or escape}
3.20%	4.66%	fluid {backflow or escape}
2.60%	1.23%	block {backflow or escape} [perform operation]
1.92%	1.19%	{backflow or escape} port
1.08%	2.31%	air {backflow or escape}
2.10%	0.75%	{backflow or escape} valve
0.93%	1.76%	allow {backflow or escape} [perform operation]
1.36%	0.77%	avoid {backflow or escape} [perform operation]
0.85%	0.34%	{backflow or escape} means