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_1 for which y_1 will play tennis if and only if y_1 is a lawyer. For all y_1, y_1 will drink water if and only if y_1 will play tennis.
For all y_1, if y_1 drinks water, then y_1 is playing tennis. There is at least one y_1 for which if y_1 plays tennis, then y_1 is a lawyer. For all y_1, if y_1 plays tennis, then y_1 is drinking water. There is at least one y_1 for which if y_1 were a lawyer, then y_1 is playing tennis.