Intuitively, if data for several predicates strongly suggests that two argument keys should be clustered (e.g., there is a large overlap between argument fillers for the two keys) then the posterior will indicate that d i,j is expected to be greater for the pair {i, j} than for some other pair {i , j } for which the evidence is less clear.
argument keys i and j will be clustered even for predicates without strong evidence for such a clustering, whereas i and j will not.