Matched context for migration and back-flow

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

Share - migration	Share - back-flow	Phrase
4.80%	27.51%	prevent {migration or back-flow} [perform operation]
2.47%	7.24%	oil {migration or back-flow}
1.75%	6.55%	fuel {migration or back-flow}
1.56%	6.12%	gas {migration or back-flow}