Matched context for contraction and blockage

The page lists matched contexts for contraction and blockage.

Share - contraction	Share - blockage	Phrase
5.33%	4.25%	{contraction or blockage} [does] cause
1.75%	6.62%	{contraction or blockage} [does] occur
2.50%	3.95%	cause {contraction or blockage} [perform operation]
1.86%	4.63%	effect {contraction or blockage} [perform operation]
0.77%	2.46%	provide {contraction or blockage} [perform operation]