Matched context for obstacle and irregularity

The page lists matched contexts for obstacle and irregularity.

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