Consider the following premises. P_8(h) -> Q_8(h). forall x_8: P_8(x_8) -> Q_8(x_8). forall x_8: Q_8(x_8) -> P_8(x_8). Can we infer P_8(h) <-> Q_8(h) from them? If possible, name the inference rules being used at each step.
 From forall x_8: P_8(x_8) -> Q_8(x_8), forall x_8: Q_8(x_8) -> P_8(x_8) we can infer forall x_8: P_8(x_8) <-> Q_8(x_8) via universal biconditional introduction. Finally, from forall x_8: P_8(x_8) <-> Q_8(x_8) we can infer P_8(h) <-> Q_8(h) via universal instantiation. Therefore, the answer is yes.