Matched context for stratify and pre-heating

The page lists matched contexts for stratify and pre-heating.

Share - stratify	Share - pre-heating	Phrase
11.82%	40.29%	{stratify or pre-heating} fuel [perform operation]
3.47%	25.94%	{stratify or pre-heating} air [perform operation]
2.54%	33.75%	provide for {stratify or pre-heating}