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Five independently generated Boolean query formulations for ten different TREC topics were produced by ten different expert online searchers. These different formulations were grouped, and the groups, and combinations of them, were used as searches against the TREC test collection, using the INQUERY probabilistic inference network retrieval engine, Results show that progressive combination of query formulations leads to progressively improving retrieval performance, Results were compareddoi:10.1145/160688.160760 dblp:conf/sigir/BelkinCCC93 fatcat:ghw3ahiaavd7loqayktbwpayzm