Scheme of choosing the corresponding process. There is saved information for concrete transitions (lower rectangle represents transition of a specific type with a definition (Eq. (25))). Number of these transitions can be very high. For saving a computer time, first of all it is determined which process occurs. All total transition probabilities for specific processes are determined with Eq. (23). After the process determination the programme goes through all possible transitions and chooses the right one which satisfies the condition described in the text. In the example here eight processes are possible, out of them the fourth process is chosen and it contains eleven transitions. The fifth transition is then selected.