1. TCS, KTH Royal Institute of Technology School of Computer Science and Communication, 156318 Stockholm, Stockholm, Sweden, (e-mail: heye@kth.se)
2. TCS, KTH Royal Institute of Technology School of Computer Science and Communication, 156318 Stockholm, Stockholm, Sweden, (e-mail: jiagu@kth.se)
3. Informatique, Universite de Valenciennes et du Hainaut-Cambresis Antenne de Maubeuge, 244686 Maubeuge, Nord, France, (e-mail: matias.martinez@univ-valenciennes.fr)
4. TCS, KTH, 7655 Stockholm, Stockholm, Sweden, 100 44 (e-mail: thomas@durieux.me)
5. EECS - TCS, KTH Royal Institute of Technology, Stockholm, Stockholm, Sweden, 10044 (e-mail: martin.monperrus@csc.kth.se)