"All Others" or Reverse Query for a topic
Client would like, for any topic, the ability to auto-generate a sub topic that includes all results NOT appearing in any other sub-topic. The result would be a set of subtopics that encompass all mentions in a given topic.
Another option would be: In the conversations section the ability to filter based on sub-topic. If there was an option to filter for any conversation not housed in a sub-topic that would have a similar benefit.