 Note that (1) implies (2) and (3), which each imply (4); (5) is independent of (1–4). The notion of partial ground might in turn be defined in terms of full ground, which relates a plurality of facts (e.g. the fact that snow is white and the fact that grass is green) to a single fact (e.g. the fact that snow is white and grass is green): one fact partially grounds another just in case it belongs to some plurality of facts that fully grounds  it.[66] 