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* **Extend**: Allows to extend a base process. Represents the first operator performed during a tailoring activity (Figure 4).   * **Suppress**: Allows to suppress a task from a reused base process (Figure 5).   * **Contribute**: Allows to add a task to a reused base process  (Figure 6). * **Modify**: Allows to modify any property of a reused process element  (Figure 7).