What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? P_1(a_1). forall y_4: W_2(y_4). forall y_4: U_2(y_4).
exists x: P_1(x). forall y_4: W_2(y_4) and U_2(y_4). forall y_4: U_2(y_4) and W_2(y_4).