What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all x_6, x_6 is sad if and only if x_6 is poor. For all x_6, if x_6 were sad, then x_6 is driving a car. For all x_6, if x_6 drives a car, then x_6 is poor.
For all x_6, if x_6 were sad, then x_6 is poor. For all x_6, if x_6 were sad, then x_6 is poor. For all x_6, if x_6 were poor, then x_6 is sad.