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IntroductionThe algorithm PrefixSpan (Prefix-projected Sequential Pattern mining), designed by Pei et al.(1), enumerates frequent sequential patterns from a set of sequences. Frequent means that a sequence occurs in no less than N, where N is a user given threshold usually called minimum support. DownloadPrefixSpan is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License. PrefixSpan is distributed in the hope that it will be useful, but WITHOUT