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 if x writes a letter, then x is a sailor. For all x, x is an electrician if and only if x will write a letter. For all x, x is a sailor if and only if x is an electrician.
For all x, if x were an electrician, then x is writing a letter. For all x, if x were a sailor, then x is an electrician. For all x, if x writes a letter, then x is an electrician. For all x, if x were an electrician, then x is a sailor.