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 for which x is an electrician if and only if x will read a book. For all x, if x works, then x is an electrician. For all x, if x were an electrician, then x is working.
For all x, x will work if and only if x is an electrician. For all x, x is an electrician if and only if x will work. There is at least one x for which if x were an electrician, then x is reading a book. There is at least one x for which if x reads a book, then x is an electrician.