Matched context for expulsion and backflow

The page lists matched contexts for expulsion and backflow.

Share - expulsion	Share - backflow	Phrase
13.56%	22.00%	prevent {expulsion or backflow} [perform operation]
16.16%	6.36%	fuel {expulsion or backflow}
9.03%	4.28%	gas {expulsion or backflow}
10.38%	3.20%	fluid {expulsion or backflow}
7.37%	0.75%	cause {expulsion or backflow} [perform operation]
3.43%	1.08%	air {expulsion or backflow}