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: There is at least one x_8 for which x_8 will not cook or x_8 will read a book. For all x_8, x_8 is not a cashier. For all x_8, if x_8 were a cashier, then x_8 is making tea. For all x_8, x_8 will cook or x_8 will make tea. For all x_8, if x_8 makes tea, then x_8 is a cashier.
For all x_8, x_8 will not make tea can be inferred via the universal modus tollens rule. There is at least one x_8 for which x_8 will make tea or x_8 will read a book can be inferred via the existential resolution rule. For all x_8, x_8 is a cashier if and only if x_8 will make tea can be inferred via the universal biconditional introduction rule. For all x_8, x_8 will make tea if and only if x_8 is a cashier can be inferred via the universal biconditional introduction rule.