Matched context for opening/closing and obstruct

The page lists matched contexts for opening/closing and obstruct.

Share - opening/closing	Share - obstruct	Phrase
16.24%	5.93%	{opening/closing or obstruct} path [perform operation]
14.29%	2.70%	{opening/closing or obstruct} passage [perform operation]
7.06%	3.55%	{opening/closing or obstruct} opening [perform operation]
6.24%	4.02%	valve [does] {opening/closing or obstruct}