What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all x_13, x_13 will drink water. For all x_13, if x_13 were an astronaut, then x_13 is happy. There is at least one x_13 for which x_13 is an astronaut or x_13 is a police officer. For all x_13, x_13 is happy if and only if x_13 is a police officer.
For all x_13, if x_13 were happy, then x_13 is a police officer. For all x_13, if x_13 were a police officer, then x_13 is happy.