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_9, if x_9 works, then x_9 is drinking water. For all x_9, if x_9 climbs a mountain, then x_9 is running. There is at least one x_9 for which x_9 will work or x_9 is a taxi driver. For all x_9, x_9 will go running or x_9 is not a taxi driver. For all x_9, if x_9 drinks water, then x_9 is climbing a mountain.
For all x_9, if x_9 works, then x_9 is climbing a mountain can be inferred via the universal transitivity rule. For all x_9, if x_9 drinks water, then x_9 is running can be inferred via the universal transitivity rule. For all x_9, if x_9 were a taxi driver, then x_9 is running can be inferred via the universal rewriting rule.