Matched context for spout and prevent back

The page lists matched contexts for spout and prevent back.

Share - spout	Share - prevent back	Phrase
13.51%	22.16%	{spout or prevent back} flow [perform operation]
11.29%	7.78%	{spout or prevent back} fuel [perform operation]
5.25%	4.47%	chamber [location] {spout or prevent back}