Matched context for co and impurity

The page lists matched contexts for co and impurity.

Share - co	Share - impurity	Phrase
6.16%	4.42%	{co or impurity} concentration
5.98%	3.66%	oxidize {co or impurity} [perform operation]
1.22%	16.54%	remove {co or impurity} [perform operation]
1.96%	5.76%	contain {co or impurity} [perform operation]
0.12%	0.82%	cause {co or impurity} [perform operation]