What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? Michael is an artist or Barbara is not an electrician. If it is cold, then Charles is reading a book. Charles is reading a book if and only if Michael is an artist. It is not cold. If Charles reads a book, then it is cold.
Charles is not reading a book. If Barbara were an electrician, then Michael is an artist. It is cold if and only if Charles is reading a book. Charles is reading a book if and only if it is cold. If Charles reads a book, then Michael is an artist. If Michael were an artist, then Charles is reading a book.