\bibitem{strebio09} Vlado Keselj, Haibin Liu, Norbert Zeh, Christian Blouin, Chris Whidden. \newblock Finding Optimal Parameters for Edit Distance Based Sequence Classification is NP-Hard. \newblock In {\em Proceedings of StReBio'09, KDD-09 Workshop on Statistical Relational Mining and Learning in Bioinformatics\/.} Paris, France, June 2009.