Matched context for fluoride and nitrite

The page lists matched contexts for fluoride and nitrite.

Share - fluoride	Share - nitrite	Phrase
5.74%	3.43%	calcium {fluoride or nitrite}
3.68%	3.58%	strontium {fluoride or nitrite}
3.75%	3.19%	barium {fluoride or nitrite}
3.71%	3.16%	magnesium {fluoride or nitrite}