What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all x_4, x_4 will drink water if and only if x_4 is poor. For all x_4, x_4 will drink water if and only if x_4 is poor.
For all x_4, if x_4 drinks water, then x_4 is poor. For all x_4, if x_4 drinks water, then x_4 is poor. For all x_4, if x_4 were poor, then x_4 is drinking water. For all x_4, if x_4 were poor, then x_4 is drinking water.