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_14, x_14 is a server if and only if x_14 is a poet. Elisabeth is a poet or Michael is a janitor. Elisabeth is a server or Michael is not a janitor.
If Michael were a janitor, then Elisabeth is a server can be inferred via the rewriting rule. For all x_14, if x_14 were a server, then x_14 is a poet can be inferred via the universal biconditional elimination rule. For all x_14, if x_14 were a poet, then x_14 is a server can be inferred via the universal biconditional elimination rule.