What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? forall y_2: R_4(y_2) -> U_4(y_2). forall y_2: R_4(y_2). forall y_2: S_1(y_2).
forall y_2: U_4(y_2). forall y_2: R_4(y_2) and S_1(y_2). forall y_2: S_1(y_2) and R_4(y_2).