What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all x_9, x_9 is a police officer or x_9 is not fast. For all x_9, x_9 is sad or x_9 is fast. For all x_9, if x_9 were a police officer, then x_9 is sad. For all x_9, if x_9 were sad, then x_9 is a police officer.
For all x_9, if x_9 were fast, then x_9 is a police officer. For all x_9, x_9 is a police officer if and only if x_9 is sad. For all x_9, x_9 is sad if and only if x_9 is a police officer.