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Our demonstration shows the hierarchy system working on a locally run search engine. Hierarchies are dynamically generated from the retrieved documents, and visualised on the menus. When a user selects a term from the hierarchy, the documents linked to the term are listed, and the term is then added to the initial query to rerun a search. Through the demonstration we illustrate how hierarchical presentation of expansion terms is achieved, and how our approach supports users to articulate theirdoi:10.1145/564376.564495 dblp:conf/sigir/JohoSB02 fatcat:k3y263fmp5a3jm7hcxpzfh2ufi