Matched context for obstruct and opening/closing

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

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