Matched context for port and block off

The page lists matched contexts for port and block off.

Share - port	Share - block off	Phrase
5.52%	2.12%	{port or block off} opening [perform operation]
2.95%	4.06%	valve [does] {port or block off}
1.56%	4.30%	{port or block off} chamber [perform operation]
2.48%	2.68%	{port or block off} pressure [perform operation]