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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 get_dummy_router_net(self, tenant_id):
 """Retrieves the dummy router information from service object. """

        if tenant_id not in self.service_attr:
            LOG.error("Fabric not prepared for tenant %s", tenant_id)
            return
        tenant_obj = self.get_service_obj(tenant_id)
        return tenant_obj.get_dummy_router_net()