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 -> q_16. r <-> p. p <-> q_16.
r -> p can be inferred via the biconditional elimination rule. p -> q_16 can be inferred via the biconditional elimination rule. p -> r can be inferred via the biconditional elimination rule. q_16 -> p can be inferred via the biconditional elimination rule.