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The composition operators are functions that take two processes as input and generate a third one. The result process represents the composition of the processes provided. There are different strategies to perform a processes composition. Each operator described below implements one specific rule.  * **Serial Composition**: takes Takes  two processes and performs a serial composition - the parameters order are important to the operator behavior. (Figure 2) * **Parallel Composition**: takes Takes  two processes and perform a parallel composition - the parameters order are not relevant to the operator behavior (Figure 3)