Matched context for by-product and purifier

The page lists matched contexts for by-product and purifier.

Share - by-product	Share - purifier	Phrase
2.14%	32.35%	exhaust [physical/chemical] {by-product or purifier}
0.94%	20.06%	gas {by-product or purifier}
1.48%	4.31%	exhaust [physical/chemical] {by-product or purifier}