20. The computer of claim 19 , wherein the pervasiveness of the candidate facet attribute relationship is measured as the likelihood that the facet attribute relationship holds true in all concept relationships in which it presents.
21. The computer of claim 20 , wherein the likelihood that the candidate facet attribute relationship holds true in all concept relationships in which it presents is determined based on a frequency with which the facet attributes related by the candidate facet attribute relationship present together in the domain of information.