What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all x_6, x_6 is a lawyer if and only if x_6 will play tennis. There is at least one x_6 for which x_6 is not a lawyer. For all x_6, x_6 is a janitor if and only if x_6 will play tennis.
For all x_6, if x_6 were a lawyer, then x_6 is playing tennis. For all x_6, if x_6 were a janitor, then x_6 is playing tennis. For all x_6, if x_6 plays tennis, then x_6 is a lawyer. For all x_6, if x_6 plays tennis, then x_6 is a janitor. There is at least one x_6 for which x_6 will not play tennis.