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: There is at least one z for which z will drive a car and z is a musician. For all z, z is a janitor.
There is at least one z for which z will drive a car can be inferred via the existential simplification rule. There is at least one z for which z is a musician can be inferred via the existential simplification rule.