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_3, x_3 is not happy or x_3 will work. For all x_3, x_3 is a writer. For all x_3, x_3 is not a writer or x_3 is an artist.
Nothing can be inferred from these premises.