What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? There is at least one x_12 for which x_12 will not work. For all x_12, x_12 is a police officer if and only if x_12 is a janitor. For all x_12, x_12 is a police officer if and only if x_12 will work.
For all x_12, if x_12 were a police officer, then x_12 is a janitor. For all x_12, if x_12 were a police officer, then x_12 is working. For all x_12, if x_12 were a janitor, then x_12 is a police officer. For all x_12, if x_12 works, then x_12 is a police officer. There is at least one x_12 for which x_12 is not a police officer.