What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all x_10, x_10 will listen to a song if and only if x_10 will read a book. There is at least one x_10 for which if x_10 listens to a song, then x_10 is reading a book. For all x_10, if x_10 reads a book, then x_10 is listening to a song.
There is at least one x_10 for which x_10 will listen to a song if and only if x_10 will read a book. There is at least one x_10 for which x_10 will read a book if and only if x_10 will listen to a song. For all x_10, if x_10 listens to a song, then x_10 is reading a book. For all x_10, if x_10 reads a book, then x_10 is listening to a song.