What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? Name the inference rule being used: forall x_7: ~P_7(x_7) or R_2(x_7). forall x_7: ~P_4(x_7) or R(x_7). P_7(a_7).
exists x: P_7(x) can be inferred via the existential generalization rule.