1cdf8355_s_of_a_Faceted_Navigation_OPAC__Logical_Rule
[Coded Action] Previous Term [Explanation] Searches on a term again [Logical Rule] 
Ntt has a value. Ntt value has appeared previously in the same session.
The Code4Lib Journal – Extracting User Interaction Information from the Transaction Logs of a Faceted Navigation OPAC