Assertion: comet's designation | /r/MadeOf | the year of their discovery
Facets:
Source sentences:
text: Until 1994, comets were first given a provisional designation consisting of the year of their discovery followed by a lowercase letter indicating its order of discovery in that year
text: Until 1994, comets were first given a provisional designation consisting of the year of their discovery followed by a lowercase letter indicating its order of discovery in that year