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 -> t. ~s. p_6 -> s. t -> p_6.
~p_6 can be inferred via the modus tollens rule. p -> p_6 can be inferred via the transitivity rule. t -> s can be inferred via the transitivity rule.