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_9, x_9 is a musician if and only if x_9 will cook. For all x_9, x_9 will cook. For all x_9, x_9 is not a musician.
Since the premises are contradictory, we can infer anything from them.