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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 _set_master_state(self, state):
 """Set the state of the SDPMaster."""

        if state == 'init':
            self._service_state.update_current_state('init', force=True)
            self.set_state(DevState.INIT)

        elif state == 'on':
            self.set_state(DevState.ON)
            self._service_state.update_current_state('on')