association rule, correlation, or causality), frequent patterns are used as intermediate data for computing final results, so there is no need to access these patterns again.
in some other tasks, such as query suggestion (or query recommendation) (Li, 2008), when a user enter a keyword, the search engine will recommend the potential phrases (or patterns) the user may want to use, in order to: (a) save time for users, (b) make the convenience of use, and even (c) guide the user in case he/she is not sure about what to search for.