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, if x sleeps, then x is a server. For all x, x will sleep if and only if x is a server. Jennifer is not a server.
For all x, if x sleeps, then x is a server can be inferred via the universal biconditional elimination rule. For all x, if x were a server, then x is sleeping can be inferred via the universal biconditional elimination rule.