Matched context for byproduct and gas

The page lists matched contexts for byproduct and gas.

Share - byproduct	Share - gas	Phrase
22.78%	11.98%	exhaust [physical/chemical] {byproduct or gas}
56.17%	1.21%	combustion {byproduct or gas}
12.67%	0.80%	discharge {byproduct or gas} [perform operation]
8.37%	0.17%	{byproduct or gas} emission