What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all y_1, y_1 will not drink water. There is at least one y_1 for which if y_1 plays tennis, then y_1 is drinking water. For all y_1, y_1 will play tennis if and only if y_1 will take a plane.
There is at least one y_1 for which y_1 will not play tennis. For all y_1, if y_1 plays tennis, then y_1 is taking a plane. For all y_1, if y_1 takes a plane, then y_1 is playing tennis.