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 a cashier, then x_3 is reading a book. For all x_3, x_3 is not fast or x_3 is a cashier. For all x_3, if x_3 were rich, then x_3 is reading a book. For all x_3, if x_3 were a taxi driver, then x_3 is rich. For all x_3, x_3 is fast or x_3 is a taxi driver.
For all x_3, if x_3 were a taxi driver, then x_3 is reading a book. For all x_3, x_3 is a taxi driver or x_3 is a cashier.