Consider the following premises. forall x_7: P_7(x_7) -> U(x_7). forall x_7: P_2(x_7) or ~U(x_7). exists x_7: P_7(x_7). Can we infer exists x_7: P_2(x_7) from them? If possible, name the inference rules being used at each step.
 From forall x_7: P_7(x_7) -> U(x_7), exists x_7: P_7(x_7) we can infer exists x_7: U(x_7) via existential modus ponens. From forall x_7: P_2(x_7) or ~U(x_7) we can infer forall x_7: U(x_7) -> P_2(x_7) via universal rewriting. Finally, from forall x_7: U(x_7) -> P_2(x_7), exists x_7: U(x_7) we can infer exists x_7: P_2(x_7) via existential modus ponens. Therefore, the answer is yes.