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_3 or ~s_1. p_3 -> s_1. t_4. s_1 -> ~t_4.
~s_1 can be inferred via the modus tollens rule. p_3 -> ~t_4 can be inferred via the transitivity rule. s_1 -> p_3 can be inferred via the rewriting rule.