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 <-> p. p_2 -> p. ~p_12.
p_12 -> p can be inferred via the biconditional elimination rule. p -> p_12 can be inferred via the biconditional elimination rule. ~p can be inferred via the biconditional elimination rule.