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Joanna Olbryś
Białystok University of Technology Faculty of Computer Science, Department of Theoretical Computer Science Wiejska 45A, 15-351 Białystok, Poland
Elżbieta Majewska
University of Białystok Faculty of Mathematics and Informatics, Institute of Mathematics Department of Applied Mathematics K. Ciołkowskiego 1M, 15-245 Białystok, Poland