Matched context for block off and unblock

The page lists matched contexts for block off and unblock.

Share - block off	Share - unblock	Phrase
6.15%	13.84%	{block off or unblock} port [perform operation]
2.12%	16.55%	{block off or unblock} opening [perform operation]
2.60%	5.48%	{block off or unblock} passage [perform operation]
4.06%	3.39%	valve [does] {block off or unblock}
1.87%	3.81%	member [does] {block off or unblock}
1.15%	4.53%	means [does] {block off or unblock}