Matched context for irregularity and obstacle

The page lists matched contexts for irregularity and obstacle.

Share - irregularity	Share - obstacle	Phrase
13.42%	8.88%	encounter {irregularity or obstacle} [perform operation]
11.37%	1.63%	road {irregularity or obstacle}
1.61%	5.64%	detect {irregularity or obstacle} [perform operation]
3.72%	0.64%	{irregularity or obstacle} [does] cause
0.60%	0.94%	not {irregularity or obstacle}