What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all x_11, x_11 will listen to a song or x_11 is an artist. For all x_11, x_11 will not listen to a song or x_11 will read a book. For all x_11, if x_11 were a doctor, then x_11 is reading a book. For all x_11, if x_11 reads a book, then x_11 is a doctor. For all x_11, x_11 is a doctor if and only if x_11 is an artist.
For all x_11, x_11 is an artist or x_11 will read a book. For all x_11, x_11 is a doctor if and only if x_11 will read a book. For all x_11, x_11 will read a book if and only if x_11 is a doctor. For all x_11, if x_11 were a doctor, then x_11 is an artist. For all x_11, if x_11 were an artist, then x_11 is a doctor.