Assertion: heavy fuel oil | /r/MadeOf | a lot of the contaminants
Facets:
Source sentences:
text: Heavy fuel oil or residual oil is a by-product of crude oil refining process, containing a lot of the contaminants removed from the lighter oils.
text: Heavy fuel oil or residual oil is a by-product of crude oil refining process, containing a lot of the contaminants removed from the lighter oils.