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_6, x_6 is not a bartender or x_6 will take a plane. For all x_6, if x_6 were a lawyer, then x_6 is an astronaut. For all x_6, x_6 is not an astronaut. There is at least one x_6 for which x_6 is a bartender or x_6 is a lawyer.
For all x_6, x_6 is not a lawyer can be inferred via the universal modus tollens rule. There is at least one x_6 for which x_6 is a lawyer or x_6 will take a plane can be inferred via the existential resolution rule.