1. Institut des Hautes Études Scientifiques, Bures-sur-Yvette, France ; and Université de Genève, Section de Mathématiques, Geneva, Switzerland hugo.duminil@unige.ch
2. School of Mathematics, Tata Institute of Fundamental Research, Mumbai, India
3. Department of Mathematics, Imperial College London, London, United Kingdom
4. Departement Mathematik, ETH Zürich, Zürich, Switzerland