What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all x_7, x_7 is a doctor. For all x_7, x_7 is a doctor if and only if x_7 is poor. There is at least one x_7 for which if x_7 drinks water, then x_7 is not poor.
For all x_7, if x_7 were a doctor, then x_7 is poor. For all x_7, if x_7 were poor, then x_7 is a doctor.