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 x_7 for which x_7 is a doctor or x_7 will not go running. For all x_7, if x_7 were a doctor, then x_7 is an artist. For all x_7, if x_7 were an artist, then x_7 is cooking.
For all x_7, if x_7 were a doctor, then x_7 is cooking can be inferred via the universal transitivity rule. There is at least one x_7 for which if x_7 goes running, then x_7 is a doctor can be inferred via the existential rewriting rule.