I want to thank Omsk State University, Nicolaus Copernicus University and program for exchange of students Erasmus+ for the chance given me to realize this project and to get acquainted with all these wonderful people. And of course I want to thank all of those, who agreed to be a part of this project: Adrián Feás Feáns, Bohdan Shchupak, Emre Yüksel, Irina Boinegri, Javier Casas López, Javier Prades, Miguel Menezes, Miron Mardale, Miriam Schikora, Oguz Kose, Vladislav Zholnerchuk.