What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? forall x_1: P(x_1) or Q(x_1). forall x_1: Q_1(x_1) -> R_1(x_1). exists x_1: P(x_1) -> Q_1(x_1). forall x_1: Q(x_1) -> R_1(x_1).
exists x_1: P(x_1) -> R_1(x_1).