1. Legal Innovation Lab Wales, Swansea University , Singleton Park, Sketty, Swansea, SA28PP, UK
2. Department of Mathematics and Computer Science, University of Calabria , Via Pietro Bucci, cubo 30B, Rende (CS), 87036, Italy
3. Department of Computer Science and Engineering, University of Bologna , Mura Anteo Zamboni 7, Bologna, 40126, Italy
4. Department of Mathematics and Computer Science, University of Calabria , Via Pietro Bucci, cubo 30B, Rende (CS), 87036, Italy and DLVSystem SRL, Viale della Resistenza 19, Quattromiglia (CS), 87036, Italy
5. Dipartimento di Informatica, Università di Torino , Corso Svizzera 185, Torino, 10149, Italy