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 will play tennis if and only if x_9 is a sailor. For all x_9, if x_9 were a server, then x_9 is working. For all x_9, x_9 is a server. For all x_9, x_9 is a sailor or x_9 will play squash. For all x_9, if x_9 plays squash, then x_9 is playing tennis.
For all x_9, x_9 will work. For all x_9, if x_9 plays tennis, then x_9 is a sailor. For all x_9, if x_9 were a sailor, then x_9 is playing tennis.