What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all x_15, x_15 is a politician if and only if x_15 is poor. For all x_15, x_15 is poor if and only if x_15 is happy. There is at least one x_15 for which if x_15 were a politician, then x_15 is happy.
For all x_15, if x_15 were a politician, then x_15 is poor. For all x_15, if x_15 were poor, then x_15 is happy. For all x_15, if x_15 were poor, then x_15 is a politician. For all x_15, if x_15 were happy, then x_15 is poor.