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_7 for which x_7 will sleep or x_7 is a writer. For all x_7, x_7 is a police officer or x_7 is not a writer. For all x_7, x_7 will sleep if and only if x_7 is a police officer.
For all x_7, if x_7 were a writer, then x_7 is a police officer. For all x_7, if x_7 sleeps, then x_7 is a police officer. For all x_7, if x_7 were a police officer, then x_7 is sleeping.