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 x for which if x drinks water, then x is sleeping. For all x, if x drinks water, then x is sleeping. For all x, if x sleeps, then x is drinking water.
For all x, x will drink water if and only if x will sleep. For all x, x will sleep if and only if x will drink water. There is at least one x for which x will drink water if and only if x will sleep. There is at least one x for which x will sleep if and only if x will drink water.