Matched context for shortage and back-flow

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

Share - shortage	Share - back-flow	Phrase
18.47%	7.24%	oil {shortage or back-flow}
4.77%	27.51%	prevent {shortage or back-flow} [perform operation]
16.30%	6.55%	fuel {shortage or back-flow}
7.80%	9.86%	fluid {shortage or back-flow}
4.84%	4.08%	air {shortage or back-flow}