What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all x_3, if x_3 were happy, then x_3 is listening to a song. There is at least one x_3 for which if x_3 listens to a song, then x_3 is happy. For all x_3, x_3 is not happy. For all x_3, x_3 will listen to a song if and only if x_3 is an office clerk.
There is at least one x_3 for which x_3 will not listen to a song. There is at least one x_3 for which x_3 will listen to a song if and only if x_3 is happy. There is at least one x_3 for which x_3 is happy if and only if x_3 will listen to a song. For all x_3, if x_3 listens to a song, then x_3 is an office clerk. For all x_3, if x_3 were an office clerk, then x_3 is listening to a song.