 The particle rules for propositional connectives are like those in  Section 2.1.1,  with an additional indication concerning the dialogical context (denoted \(c_{i}\)), which, however, does not modify the current context. Propositional connectives are thus unlike unary connectives such as modal operators, which provoke a dialogical context change according to the particle rules. In this regard, the only difference between the possibility operator and the necessity operator pertains to which player may choose the new context (in the rule for the necessity operator, “\(c_{j}/c_{i}\)” is read as the request to substitute \(c_j\) for \(c_i\)). This point illustrates once again the key role of choice in the dialogical approach to meaning built through the game rules.