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: r -> p. p_8 -> r. ~w. p <-> w. p -> p_8.
r -> p_8 can be inferred via the transitivity rule. p_8 -> p can be inferred via the transitivity rule. p -> r can be inferred via the transitivity rule. p -> w can be inferred via the biconditional elimination rule. w -> p can be inferred via the biconditional elimination rule. ~p can be inferred via the biconditional elimination rule.