What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all x_2, x_2 will not go running. For all x_2, if x_2 plays tennis, then x_2 is a doctor. There is at least one x_2 for which if x_2 were a doctor, then x_2 is running. For all x_2, if x_2 were a doctor, then x_2 is playing tennis.
There is at least one x_2 for which x_2 is not a doctor. There is at least one x_2 for which if x_2 plays tennis, then x_2 is running. For all x_2, x_2 will play tennis if and only if x_2 is a doctor. For all x_2, x_2 is a doctor if and only if x_2 will play tennis.