Department of Mathematics, London School of Economics and Political Science, London, UK.|Department of Computer Science, Helsinki Institute for Information Technology HIIT, University of Helsinki, Finland.|University of Primorska, UP IAM, Koper, Slovenia.|Genome-Scale Biology Research Program, Research Programs Unit, Department of Medical and Clinical Genetics, Faculty of Medicine, University of Helsinki, Medicum, Helsinki, Finland.|Department of Computer Science, University of Verona, Verona, Italy.|Department of Computer Science, Helsinki Institute for Information Technology HIIT, University of Helsinki, Finland.|University of Primorska, UP IAM, Koper, Slovenia.|Department of Computer Science, Helsinki Institute for Information Technology HIIT, University of Helsinki, Finland.