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In this paper, we study the problem of automating the retrieval of data hidden behind simple search interfaces that accept keyword-based queries. Our goal is to automatically retrieve all available results (or, as many as possible). We propose a new approach to siphon hidden data that automatically generates a small set of representative keywords and builds queries which lead to high coverage. We evaluate our algorithms over several real Web sites. Preliminary results indicate our approach is effective: coverage of over 90% is obtained for most of the sites considered.