Translate the following inference to logic notation: For all x, x_11 will listen to a song if and only if x_11 is a lawyer. For all x, x_11 will listen to a song if and only if x_11 is a lawyer. Therefore if Jessica listens to a song, then Jessica is a lawyer.
forall x: P(x) <-> Q(x). forall x: P(x) <-> Q(x). Therefore P(a) -> Q(a).