Institute of Computing Science, Poznan University of Technology, Poznan 60-965, Poland.|Institute of Bioorganic Chemistry, Polish Academy of Sciences, Poznan 61-704, Poland.|Institute of Computing Science, Poznan University of Technology, Poznan 60-965, Poland.|Institute of Computing Science, Poznan University of Technology, Poznan 60-965, Poland.|Institute of Computing Science, Poznan University of Technology, Poznan 60-965, Poland.|Institute of Computing Science, Poznan University of Technology, Poznan 60-965, Poland.