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_1 for which z_1 will go running or z_1 is not an artist. For all z_1, if z_1 were a janitor, then z_1 is an artist. For all z_1, if z_1 goes running, then z_1 is a doctor.
There is at least one z_1 for which if z_1 were an artist, then z_1 is running can be inferred via the existential rewriting rule.