Designing a commutative replicated data type for cooperative editing systems Nuno Pregui¸ ca * , Marc Shapiro # Technical report 2-2008 DI-FCT-UNL # INRIA Paris-Rocquencourt & LIP6 Paris, France ∗ CITI/DI Faculdade de Ciˆencias e Tecnologia Universidade Nova de Lisboa Quinta da Torre, 2829-516 Caparica, Portugal