Consider the following premises. forall x_6: P_6(x_6) or Q_6(x_6). forall x_6: ~W(x_6) or R(x_6). exists x_6: ~P_6(x_6) or W(x_6). forall x_6: ~Q_6(x_6) or S(x_6). Can we infer forall x_6: ~(S(x_6) or R(x_6)) from them? If possible, name the inference rules being used at each step.
That contradicts the premises. Therefore the answer is no.