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, if x_9 were a carpenter, then x_9 is playing squash. For all x_9, x_9 is a taxi driver or x_9 will not play squash. For all x_9, if x_9 were a taxi driver, then x_9 is a carpenter.
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.