Matched context for bubble and back-flow

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

Share - bubble	Share - back-flow	Phrase
10.76%	4.08%	air {bubble or back-flow}
5.00%	6.12%	gas {bubble or back-flow}
1.00%	18.94%	{bubble or back-flow} valve
0.69%	27.51%	prevent {bubble or back-flow} [perform operation]
1.08%	6.55%	fuel {bubble or back-flow}
0.51%	2.52%	not {bubble or back-flow}