Matched context for separation and backflow

The page lists matched contexts for separation and backflow.

Share - separation	Share - backflow	Phrase
2.07%	22.00%	prevent {separation or backflow} [perform operation]
1.58%	19.24%	{separation or backflow} zone
0.51%	6.36%	fuel {separation or backflow}
0.44%	4.28%	gas {separation or backflow}
0.83%	1.33%	water {separation or backflow}
0.61%	0.85%	{separation or backflow} means
0.18%	2.10%	{separation or backflow} valve
0.19%	1.08%	air {separation or backflow}
0.63%	0.93%	allow {separation or backflow} [perform operation]
0.59%	1.36%	avoid {separation or backflow} [perform operation]
1.28%	0.75%	cause {separation or backflow} [perform operation]
0.24%	3.20%	fluid {separation or backflow}