Translate the following inference to logic notation: For all x, x_7 is an astronaut if and only if x_7 will take a plane. For all x, x_7 is an astronaut. Therefore for all x, x_7 will take a plane or x_7 is a server.
forall x: P(x) <-> Q(x). forall x: P(x). Therefore forall x: Q(x) or R(x).