What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all z, if z were a musician, then z is fast. For all z, if z works, then z is a musician. For all z, if z were fast, then z is a police officer. For all z, if z were a police officer, then z is working.
For all z, if z were a musician, then z is a police officer. For all z, if z works, then z is fast. For all z, if z were fast, then z is working. For all z, if z were a police officer, then z is a musician.