What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? John is a server or John is not writing a letter. It is overcast. If John were a server, then James is not a lawyer. James is a lawyer.
John is not a server. It is overcast and James is a lawyer. James is a lawyer and it is overcast. If John writes a letter, then John is a server.