What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all x_9, x_9 is a taxi driver if and only if x_9 will play squash. If Jessica were a taxi driver, then Jessica is playing squash.
For all x_9, if x_9 were a taxi driver, then x_9 is playing squash. For all x_9, if x_9 plays squash, then x_9 is a taxi driver.