 Third, given that each substance must have a sufficient description, the gunkyness of substances implies a contradiction if substances are either material objects or sense-data. McTaggart holds that the gunkyness of substances and the requirement that every substance have sufficient description result in a contradiction unless the following requirement is satisfied: that the universe divides itself into a set of entities – call them primary parts – whose sufficient descriptions imply sufficient descriptions of every set of parts of the universe onto infinity. In order for the sufficient descriptions of primary parts to imply the sufficient descriptions of all others, there must exist a relation of ‘determining correspondence’ such that all other objects are individuated by standing in the transitive closure of that relation to the primary parts, which in turn are individuated independently of standing in any relation of determining  correspondence.[28]