Matched context for escape and backflow

The page lists matched contexts for escape and backflow.

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