Matched context for obstacle and problem

The page lists matched contexts for obstacle and problem.

Share - obstacle	Share - problem	Phrase
8.88%	2.19%	encounter {obstacle or problem} [perform operation]
3.44%	1.29%	avoid {obstacle or problem} [perform operation]
1.01%	4.60%	overcome {obstacle or problem} [perform operation]
3.24%	1.16%	present {obstacle or problem} [perform operation]
1.06%	0.66%	{obstacle or problem} [does] exist
1.66%	0.25%	become {obstacle or problem} [perform operation]
0.94%	0.38%	not {obstacle or problem}
2.14%	0.17%	present [chronology] {obstacle or problem}