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_6 -> q_6. s_3 <-> p_6. q_6 -> w_2. ~w_2.
~q_6 can be inferred via the modus tollens rule. p_6 -> w_2 can be inferred via the transitivity rule. s_3 -> p_6 can be inferred via the biconditional elimination rule. p_6 -> s_3 can be inferred via the biconditional elimination rule.