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: ~s. p_3 <-> q_12. s <-> q_12.
p_3 -> q_12 can be inferred via the biconditional elimination rule. s -> q_12 can be inferred via the biconditional elimination rule. q_12 -> p_3 can be inferred via the biconditional elimination rule. q_12 -> s can be inferred via the biconditional elimination rule. ~q_12 can be inferred via the biconditional elimination rule.