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: Patricia is reading a book if and only if Charles is driving a car. Linda is a nurse. If Patricia reads a book, then Linda is not a nurse. Charles is driving a car or Susan is running.
Patricia is not reading a book can be inferred via the modus tollens rule. If Patricia reads a book, then Charles is driving a car can be inferred via the biconditional elimination rule. If Charles drives a car, then Patricia is reading a book can be inferred via the biconditional elimination rule.