1. West Ukrainian National University,Department of Computer Science,Ternopil,Ukraine
2. University of Bielsko-Biala,Department of Computer Science and Automatics,Bielsko-Biala,Poland
3. University in Bydgoszcz,Department of Informatics Kujawy and Pomorze,Bydgoszcz,Poland
4. West Ukrainian National University,Department of Foreign Languages, Information and Communication Technologies,Ternopil,Ukraine