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 sad, then z is a lawyer. There is at least one z for which z is a sailor or z is sad. For all z, if z were a lawyer, then z is listening to a song. For all z, if z were a sailor, then z is listening to a song.
For all z, if z were sad, then z is listening to a song.