Translate the following inference to logic notation: Patricia is sleeping if and only if Charles is making tea. Patricia is sleeping if and only if it is overcast. For all x, x_28 is an electrician. If Charles makes tea, then David is not an electrician. Therefore it is not overcast or Karen is a taxi driver.
p <-> q. p <-> r. forall x: P(x). q -> ~P(a). Therefore ~r or s.