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_15, x_15 will not work. For all x_15, x_15 will not write a letter or x_15 will play tennis. For all x_15, x_15 is not a taxi driver. There is at least one x_15 for which x_15 is a taxi driver or x_15 will drink water. For all x_15, x_15 will write a letter or x_15 will work.
There is at least one x_15 for which x_15 will drink water can be inferred via the existential disjunctive syllogism rule. For all x_15, x_15 will work or x_15 will play tennis can be inferred via the universal resolution rule.