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: Susan is not an artist. For all z, if z were an artist, then z is an electrician. For all z, z is an electrician if and only if z is an artist. If Thomas plays a game, then Susan is an electrician.
For all z, if z were an electrician, then z is an artist can be inferred via the universal biconditional elimination rule. For all z, if z were an artist, then z is an electrician can be inferred via the universal biconditional elimination rule.