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 Linda doesn't read a book, then Joseph is a bartender. It is not sunny. It is sunny if and only if Linda is reading a book.
If it is sunny, then Linda is reading a book can be inferred via the biconditional elimination rule. If Linda reads a book, then it is sunny can be inferred via the biconditional elimination rule. Linda is not reading a book can be inferred via the biconditional elimination rule.