What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? U_4(d) -> s_1. S_12(d) -> s_1. s_1 -> s. forall x_12: U_4(x_12) or S_12(x_12).
U_4(d) -> s. S_12(d) -> s.