What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? Michael is not a doctor. For all x_7, x_7 will take a plane if and only if x_7 is a doctor. Michael is taking a plane if and only if Linda is listening to a song.
If Michael takes a plane, then Linda is listening to a song. If Linda listens to a song, then Michael is taking a plane. For all x_7, if x_7 takes a plane, then x_7 is a doctor. For all x_7, if x_7 were a doctor, then x_7 is taking a plane.