What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all x, x is a taxi driver if and only if x will go running. For all x, x is not an office clerk. For all x, if x goes running, then x is an office clerk. There is at least one x for which if x were an office clerk, then x is running.
For all x, x will not go running. There is at least one x for which x is an office clerk if and only if x will go running. There is at least one x for which x will go running if and only if x is an office clerk. 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.