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_3 <-> q_11. q_11 <-> r_3.
r_3 -> q_11 can be inferred via the biconditional elimination rule. q_11 -> r_3 can be inferred via the biconditional elimination rule. q_11 -> r_3 can be inferred via the biconditional elimination rule. r_3 -> q_11 can be inferred via the biconditional elimination rule.