Translate the following inference to logic notation: For all x, z_3 will read a book if and only if z_3 is curious. For all x, if z_3 were curious, then z_3 is bored. For all x, if z_3 were bored, then z_3 is reading a book. Therefore for all x, z_3 will read a book if and only if z_3 is curious.
forall x: P(x) <-> Q(x). forall x: Q(x) -> R(x). forall x: R(x) -> P(x). Therefore forall x: P(x) <-> Q(x).