What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all y_3, y_3 is a doctor or y_3 will make tea. There is at least one y_3 for which y_3 will read a book if and only if y_3 will make tea. For all y_3, if y_3 reads a book, then y_3 is a doctor. For all y_3, if y_3 were a doctor, then y_3 is reading a book.
For all y_3, y_3 will read a book if and only if y_3 is a doctor. For all y_3, y_3 is a doctor if and only if y_3 will read a book. There is at least one y_3 for which if y_3 reads a book, then y_3 is making tea. There is at least one y_3 for which if y_3 makes tea, then y_3 is reading a book.