Translate the following inference to logic notation: For all x, x_8 will write a letter. For all x, x_8 will write a letter if and only if x_8 will make tea. For all x, x_8 is an electrician. Therefore for all x, x_8 is an electrician.
forall x: P(x). forall x: P(x) <-> Q(x). forall x: R(x). Therefore forall x: R(x).