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: It is late. For all x_14, x_14 is a server if and only if x_14 will read a book. If it is windy, then Richard is a server. If Richard were a server, then it is windy. If Richard reads a book, then it is not late.
Richard is not reading a book can be inferred via the modus tollens rule. For all x_14, if x_14 were a server, then x_14 is reading a book can be inferred via the universal biconditional elimination rule. For all x_14, if x_14 reads a book, then x_14 is a server can be inferred via the universal biconditional elimination rule.