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: For all x_8, x_8 is fast. For all x_8, if x_8 were a cashier, then x_8 is reading a book. For all x_8, x_8 is a cashier. For all x_8, if x_8 reads a book, then x_8 is a mechanic.
For all x_8, x_8 will read a book can be inferred via the universal modus ponens rule. For all x_8, if x_8 were a cashier, then x_8 is a mechanic can be inferred via the universal transitivity rule. For all x_8, x_8 is fast and x_8 is a cashier can be inferred via the universal conjunction rule. For all x_8, x_8 is a cashier and x_8 is fast can be inferred via the universal conjunction rule.