What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all x, if x were a politician, then x is drinking water. For all x, if x drinks water, then x is a politician. For all x, x will drink water if and only if x is a politician.
For all x, x is a politician if and only if x will drink water. For all x, x will drink water if and only if x is a politician. For all x, if x drinks water, then x is a politician. For all x, if x were a politician, then x is drinking water.