What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all y_2, y_2 is a scientist if and only if y_2 will play tennis. For all y_2, y_2 will not play tennis. For all y_2, if y_2 were a scientist, then y_2 is playing tennis.
For all y_2, y_2 is not a scientist. For all y_2, if y_2 were a scientist, then y_2 is playing tennis. For all y_2, if y_2 plays tennis, then y_2 is a scientist. For all y_2, y_2 is not a scientist.