What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? forall y: R(y) -> P_2(y). exists y: W_4(y) -> P_2(y). forall y: R(y) -> W_4(y). forall y: P_2(y) -> R(y).
forall y: P_2(y) -> W_4(y). exists y: W_4(y) -> R(y). exists y: R(y) -> P_2(y). forall y: R(y) <-> P_2(y). forall y: P_2(y) <-> R(y).