Matched context for blockage and shortage

The page lists matched contexts for blockage and shortage.

Share - blockage	Share - shortage	Phrase
6.62%	6.22%	{blockage or shortage} [does] occur
2.36%	16.30%	fuel {blockage or shortage}
3.95%	5.94%	cause {blockage or shortage} [perform operation]
3.81%	4.77%	prevent {blockage or shortage} [perform operation]
2.57%	4.84%	air {blockage or shortage}