Matched context for separation and back-flow

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

Share - separation	Share - back-flow	Phrase
2.07%	27.51%	prevent {separation or back-flow} [perform operation]
1.58%	9.23%	{separation or back-flow} zone
0.57%	7.24%	oil {separation or back-flow}
0.18%	18.94%	{separation or back-flow} valve
0.47%	7.91%	ensure {separation or back-flow} [perform operation]
0.51%	6.55%	fuel {separation or back-flow}
0.24%	9.86%	fluid {separation or back-flow}
0.44%	6.12%	gas {separation or back-flow}
0.19%	4.08%	air {separation or back-flow}
0.25%	2.52%	not {separation or back-flow}