Assertion: anthracite | /r/MadeOf | greater potential
Facets:
value: to produce heat energy
type: PURPOSE
Source sentences:
text: Hard coal contains greater potential to produce heat energy than softer, geologically "newer" coal.
text: Being a hard coal, it contains greater potential to produce heat energy than softer, geologically ‘newer’ coal.
text: Hard coals contain greater potential to produce heat energy than do the softer, geologically “newer” coals.