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_15 for which x_15 will not read a book. For all x_15, x_15 will read a book if and only if x_15 is a doctor. For all x_15, x_15 is a doctor or x_15 is an electrician. For all x_15, x_15 will drive a car.
For all x_15, if x_15 reads a book, then x_15 is a doctor. For all x_15, if x_15 were a doctor, then x_15 is reading a book. There is at least one x_15 for which x_15 is not a doctor.