Matched context for obstruction and plugging

The page lists matched contexts for obstruction and plugging.

Share - obstruction	Share - plugging	Phrase
3.34%	26.79%	avoid {obstruction or plugging} [perform operation]
1.10%	6.80%	cause {obstruction or plugging} [perform operation]
0.92%	8.51%	prevent {obstruction or plugging} [perform operation]