What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all x, if x were a taxi driver, then x is playing tennis. For all x, x is a taxi driver if and only if x will go running. For all x, if x plays tennis, then x is running.
For all x, if x were a taxi driver, then x is running. For all x, if x were a taxi driver, then x is running. For all x, if x goes running, then x is a taxi driver.