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_5, x_5 is a server or x_5 is fast. Sarah is not fast. For all x_5, x_5 is not a server or x_5 will write a letter.
For all x_5, x_5 is fast or x_5 will write a letter can be inferred via the universal resolution rule.