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 musician and x_5 is a server. For all x_5, if x_5 were a musician, then x_5 is working. For all x_5, if x_5 were a writer, then x_5 is working.
For all x_5, x_5 is a musician can be inferred via the universal simplification rule. For all x_5, x_5 is a server can be inferred via the universal simplification rule.