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_10, x_10 will play tennis or x_10 is poor. For all x_10, if x_10 were poor, then x_10 is an electrician. For all x_10, x_10 will not play tennis or x_10 will drink water. There is at least one x_10 for which x_10 is not an electrician.
There is at least one x_10 for which x_10 is not poor can be inferred via the existential modus tollens rule. For all x_10, x_10 is poor or x_10 will drink water can be inferred via the universal resolution rule.