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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def run(self):
 """Start and supervise services workers This method will start and supervise all children processes until the master process asked to shutdown by a SIGTERM. All spawned processes are part of the same unix process group. """


        self._systemd_notify_once()
        self._child_supervisor = _utils.spawn(self._child_supervisor_thread)
        self._wait_forever()