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. For all y_1, if y_1 were a nurse, then y_1 is drinking water. There is at least one y_1 for which y_1 will drink water if and only if y_1 is a nurse.
For all y_1, y_1 is not a nurse. There is at least one y_1 for which if y_1 drinks water, then y_1 is a nurse. There is at least one y_1 for which if y_1 were a nurse, then y_1 is drinking water. There is at least one y_1 for which y_1 is not a nurse.