What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? There is at least one x_6 for which x_6 will listen to a song. For all x_6, if x_6 were an astronaut, then x_6 is taking a plane. For all x_6, x_6 will listen to a song if and only if x_6 will take a plane.
For all x_6, if x_6 listens to a song, then x_6 is taking a plane. For all x_6, if x_6 takes a plane, then x_6 is listening to a song.