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_10, x_10 will take a plane. For all x_10, if x_10 were a carpenter, then x_10 is not making tea. For all x_10, if x_10 were a sailor, then x_10 is making tea. For all x_10, x_10 is a cashier. For all x_10, if x_10 were a cashier, then x_10 is a sailor.
For all x_10, x_10 is a sailor can be inferred via the universal modus ponens rule. For all x_10, if x_10 were a cashier, then x_10 is making tea can be inferred via the universal transitivity rule. For all x_10, x_10 will take a plane and x_10 is a cashier can be inferred via the universal conjunction rule. For all x_10, x_10 is a cashier and x_10 will take a plane can be inferred via the universal conjunction rule.