What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? There is at least one y_2 for which if y_2 plays tennis, then y_2 is playing a game. For all y_2, y_2 will play tennis if and only if y_2 will play squash. For all y_2, y_2 will not play squash. For all y_2, if y_2 plays a game, then y_2 is writing a letter. For all y_2, y_2 will play tennis or y_2 will not write a letter.
There is at least one y_2 for which if y_2 plays tennis, then y_2 is writing a letter. For all y_2, if y_2 writes a letter, then y_2 is playing tennis. For all y_2, if y_2 plays tennis, then y_2 is playing squash. For all y_2, if y_2 plays squash, then y_2 is playing tennis. For all y_2, y_2 will not play tennis.