1. Department of Philosophy, Universitat Autònoma de Barcelona, Campus UAB, 08193, Bellaterra, Catalonia, Spain
2. Barcelona Graduate School of Mathematics, 08193 Bellaterra, Catalonia, Spain, Artificial Intelligence Research Institute, 08193 Bellaterra, Catalonia, Spain, Universitat Autònoma de Barcelona, 08193 Bellaterra, Catalonia, Spain
3. Faculty of Computer Science and Mathematics, Bremen Spatial Cognition Centre, University of Bremen, 28359 Bremen, Germany