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 y, y is a janitor if and only if y is an artist. For all y, y is not an artist. For all y, y is an artist if and only if y is a janitor.
For all y, if y were a janitor, then y is an artist can be inferred via the universal biconditional elimination rule. For all y, if y were an artist, then y is a janitor can be inferred via the universal biconditional elimination rule. For all y, if y were an artist, then y is a janitor can be inferred via the universal biconditional elimination rule. For all y, if y were a janitor, then y is an artist can be inferred via the universal biconditional elimination rule. For all y, y is not a janitor can be inferred via the universal biconditional elimination rule. For all y, y is not a janitor can be inferred via the universal biconditional elimination rule.