What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all x_12, x_12 is a bartender if and only if x_12 will drink water. There is at least one x_12 for which x_12 is a sailor or x_12 is a bartender. For all x_12, x_12 is not a sailor.
There is at least one x_12 for which x_12 is a bartender. For all x_12, if x_12 were a bartender, then x_12 is drinking water. For all x_12, if x_12 drinks water, then x_12 is a bartender.