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: forall x_9: P_9(x_9). p_16 <-> p. ~p_16.
p_16 -> p can be inferred via the biconditional elimination rule. p -> p_16 can be inferred via the biconditional elimination rule. ~p can be inferred via the biconditional elimination rule.