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For the experiments run on 15 to 17 December 1997, the percentages of invalid links were, from best to worst, 1.6% for Lycos, 2.0% for Excite, 2.5% for AltaVista, 2.6% for Infoseek, 5.0% for Northern Light, and 5.3% for HotBot (pages that timed out were not included in these statistics). In comparison with the results of similar experiments performed in August 1997, the ranking of the engines in terms of the percentage of invalid links has changed significantly.