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.
22. The computer of claim 20 , wherein the plurality of concept relationships comprises a first concept relationship between a first of the plurality of concepts and a second of the plurality of concepts, and wherein the at least one hardware processor executes the processor executable instructions to identify the at least one facet attribute in the at least some of the pairs of concepts by identifying first and second facet attributes in the first of the plurality of concepts and identifying third and fourth attributes in the second of the plurality of concepts.