What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? ~P_2(a_16). u. S(a_16) <-> t. forall y: S(y) <-> P_2(y).
~P_2(a_16) and u. u and ~P_2(a_16). S(a_16) -> t. t -> S(a_16). forall y: S(y) -> P_2(y). forall y: P_2(y) -> S(y).