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_1 -> p_8. p_8 -> p. p_1 -> p_8. p <-> p_1.
p_1 -> p can be inferred via the transitivity rule. p_1 -> p can be inferred via the transitivity rule. p -> p_1 can be inferred via the biconditional elimination rule. p_1 -> p can be inferred via the biconditional elimination rule.