Translate the following inference to logic notation: For all x, x_18 will go running. For all x, x_18 will go running if and only if x_18 is a writer. For all x, if x_18 listens to a song, then x_18 is a writer. Therefore Richard is a writer or Michael is working.
forall x: P(x). forall x: P(x) <-> Q(x). forall x: R(x) -> Q(x). Therefore Q(a) or p.