What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all x_17, if x_17 were a cashier, then x_17 is a police officer. For all x_17, x_17 will write a letter. For all x_17, x_17 is a police officer or x_17 will not write a letter.
For all x_17, if x_17 writes a letter, then x_17 is a police officer.