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 -> r_8. p_8 -> p. p_8 <-> r_8.
p_8 -> r_8 can be inferred via the transitivity rule. p_8 -> r_8 can be inferred via the biconditional elimination rule. r_8 -> p_8 can be inferred via the biconditional elimination rule.