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 z for which z will write a letter or z is not an electrician. For all z, z is a bartender if and only if z will write a letter. For all z, z is a bartender or z is an electrician.
There is at least one z for which if z were an electrician, then z is writing a letter. For all z, if z were a bartender, then z is writing a letter. For all z, if z writes a letter, then z is a bartender.