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_12 <-> q_12. p <-> r. p -> q_12. ~p_12.
p_12 -> q_12 can be inferred via the biconditional elimination rule. p -> r can be inferred via the biconditional elimination rule. q_12 -> p_12 can be inferred via the biconditional elimination rule. r -> p can be inferred via the biconditional elimination rule. ~q_12 can be inferred via the biconditional elimination rule.