Consider the following premises. exists x_6: W(x_6) <-> S_4(x_6). forall x_6: Q_6(x_6) -> W(x_6). forall x_6: S_1(x_6) -> Q_6(x_6). Can we infer forall x_6: S_1(x_6) -> Q_6(x_6) from them? If possible, name the inference rules being used at each step.
That is one of the premises. Therefore, the answer is yes.