What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? Name the inference rule being used: If Karen were an artist, then it is sunny. If it is sunny, then Charles is reading a book. Charles is reading a book if and only if Karen is an artist.
If Karen were an artist, then Charles is reading a book can be inferred via the transitivity rule. If Charles reads a book, then Karen is an artist can be inferred via the biconditional elimination rule. If Karen were an artist, then Charles is reading a book can be inferred via the biconditional elimination rule.