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 will make tea if and only if x_8 will drive a car. For all x_8, if x_8 plays a game, then x_8 is making tea. There is at least one x_8 for which x_8 will not drive a car.
For all x_8, if x_8 makes tea, then x_8 is driving a car can be inferred via the universal biconditional elimination rule. For all x_8, if x_8 drives a car, then x_8 is making tea can be inferred via the universal biconditional elimination rule. There is at least one x_8 for which x_8 will not make tea can be inferred via the existential biconditional elimination rule.