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: If Linda writes a letter, then William is a janitor. For all x_5, x_5 will not drink water or x_5 will write a letter. For all x_5, x_5 will drink water or x_5 will cook. If Linda cooks, then William is a janitor.
For all x_5, x_5 will cook or x_5 will write a letter can be inferred via the universal resolution rule.