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: There is at least one x_5 for which x_5 is a mechanic. For all x_5, x_5 is a police officer or x_5 is not a mechanic. For all x_5, if x_5 were fast, then x_5 is a police officer.
For all x_5, if x_5 were a mechanic, then x_5 is a police officer can be inferred via the universal rewriting rule.