Table 2.

Examples for clusters of Wikipedia articles used in exploratory search. The table shows three examples of clusters used in our simulations. We used TF-IDF features and k-means clustering to automatically group Wikipedia articles into semantically related groups of two to ten articles.

Nausea-related	Stomach-related	Cough-related
Vomiting Nausea Motion sickness Morning sickness Drooling Hyperemesis gravidarum	Linitis plastica Stomach cancer Gastritis Atrophic gastritis Ménétrier’s disease Achlorhydria Gastroparesis Duodenal cancer Gastric dumping syndrome Stomach disease	Bronchitis Chronic bronchitis Acute bronchitis Cough Sputum