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_7, x_7 will not drive a car. For all x_7, x_7 will not climb a mountain or x_7 is a bartender. For all x_7, x_7 will climb a mountain. For all x_7, x_7 is a poet if and only if x_7 will drive a car.
For all x_7, if x_7 were a poet, then x_7 is driving a car can be inferred via the universal biconditional elimination rule. For all x_7, if x_7 drives a car, then x_7 is a poet can be inferred via the universal biconditional elimination rule. For all x_7, x_7 is not a poet can be inferred via the universal biconditional elimination rule.