What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? Name the inference rule being used: For all x_11, x_11 is not a taxi driver or x_11 is a politician. For all x_11, x_11 will not sleep. For all x_11, x_11 is an office clerk. For all x_11, x_11 is a taxi driver or x_11 will sleep.
For all x_11, x_11 will sleep or x_11 is a politician can be inferred via the universal resolution rule.