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: p or s_4. p -> p_9. p_9 or ~s_4. p_9 -> s_4.
p -> s_4 can be inferred via the transitivity rule. s_4 -> p_9 can be inferred via the rewriting rule.