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_2(a_10) <-> t. forall x_10: P_2(x_10) -> S_10(x_10).
P_2(a_10) -> t can be inferred via the biconditional elimination rule. t -> P_2(a_10) can be inferred via the biconditional elimination rule.