What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all x_10, x_10 will take a plane or x_10 is a cashier. For all x_10, if x_10 takes a plane, then x_10 is not a police officer. For all x_10, x_10 is not fast. For all x_10, x_10 is fast or x_10 is a police officer.
For all x_10, x_10 is a police officer.