What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all x_5, if x_5 were a taxi driver, then x_5 is fast. For all x_5, x_5 will read a book or x_5 is a taxi driver. For all x_5, if x_5 reads a book, then x_5 is working. For all x_5, if x_5 were fast, then x_5 is working.
For all x_5, if x_5 were a taxi driver, then x_5 is working.