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, x_5 will drive a car. For all x_5, if x_5 drives a car, then x_5 is a taxi driver. For all x_5, x_5 is a writer if and only if x_5 is a taxi driver.
For all x_5, x_5 is a taxi driver. For all x_5, if x_5 were a writer, then x_5 is a taxi driver. For all x_5, if x_5 were a taxi driver, then x_5 is a writer.