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_11, if x_11 were an artist, then x_11 is driving a car. For all x_11, x_11 will not climb a mountain. For all x_11, if x_11 drives a car, then x_11 is a taxi driver. For all x_11, x_11 will climb a mountain if and only if x_11 will drive a car. For all x_11, x_11 is an artist or x_11 is not a taxi driver.
For all x_11, if x_11 were an artist, then x_11 is a taxi driver can be inferred via the universal transitivity rule. For all x_11, if x_11 were a taxi driver, then x_11 is an artist can be inferred via the universal rewriting rule. For all x_11, if x_11 climbs a mountain, then x_11 is driving a car can be inferred via the universal biconditional elimination rule. For all x_11, if x_11 drives a car, then x_11 is climbing a mountain can be inferred via the universal biconditional elimination rule. For all x_11, x_11 will not drive a car can be inferred via the universal biconditional elimination rule.