EA_MODEL Modelization of the requirements 5.10.1.1 - 5.10.1.2 - 5.10.2.10 - 5.10.2.2 which say that a level transition order can be announced via balise or RBC and consist of and order of change of level and a location to do it. Also say that any combination of level can be possible. Improved version with initialization of variables implemented, separation of rules and requirements revised