Translate the following inference to logic notation: For all x, x is a janitor if and only if x will play tennis. For all x, x is a musician if and only if x is a janitor. For all x, x is a sailor if and only if x is a musician. Therefore for all x, if x were a sailor, then x is playing tennis.
forall x: P(x) <-> Q(x). forall x: R(x) <-> P(x). forall x: S(x) <-> R(x). Therefore forall x: S(x) -> Q(x).