What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all x_5, if x_5 plays tennis, then x_5 is working. For all x_5, if x_5 works, then x_5 is playing tennis. There is at least one x_5 for which x_5 will not work.
There is at least one x_5 for which x_5 will not play tennis. For all x_5, x_5 will play tennis if and only if x_5 will work. For all x_5, x_5 will work if and only if x_5 will play tennis.