34. A method implemented by one or more computer processors, the method comprising: clustering a plurality of semantic graphs that were formed based on a linguistic analysis of a corpus of user utterances into a plurality of semantic clusters through use of one or more proximity metrics; identifying which of the plurality of semantic clusters include divergent sub-clusters; and offering the identified semantic clusters for review in a user interface.
36. A method as described III claim 34 , wherein the clustering is performed hierarchically at two levels.