1. Univ Lyon, CNRS, ENS de Lyon, Université Claude Bernard Lyon 1, LIP UMR5668, Lyon, France.
2. Faculty of Mathematics and Information Science, Warsaw University of Technology, Warsaw, Poland.
3. Faculty of Mathematics, Informatics and Mechanics, Institute of Informatics, University of Warsaw, Warsaw, Poland.
4. Université Paris-Dauphine, PSL University, CNRS, LAMSADE, Paris, France.