1. Faculty of Physics, Centre of Excellence for Complex Systems Research, Warsaw University of Technology, Koszykowa 75, 00-662 Warszawa, Poland
2. Interaction Technologies Group, Austrian Research Institute for Artificial Intelligence, Freyung 6/3/1a, A-1010 Vienna, Austria
3. School of Technology, University of Wolverhampton, Wulfruna Street, Wolverhampton WV1 1LY, United Kingdom