2. The method of claim 1 , further comprising identifying, based on the user search activity, a set of follow-up queries for the query pair, each follow-up query in the set being a query that was received following receipt of the first query and the second query in at least one previous user search session, the set of follow-up queries including the third query.
3. The method of claim 2 , further comprising selecting, for providing to the user device, the third query from the set of follow-up queries based on the ratio meeting the query suggestion threshold frequency.