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_1, y_1 is an artist if and only if y_1 is an electrician. There is at least one y_1 for which y_1 is rich if and only if y_1 is an electrician.
For all y_1, if y_1 were an artist, then y_1 is an electrician can be inferred via the universal biconditional elimination rule. There is at least one y_1 for which if y_1 were rich, then y_1 is an electrician can be inferred via the existential biconditional elimination rule. For all y_1, if y_1 were an electrician, then y_1 is an artist can be inferred via the universal biconditional elimination rule. There is at least one y_1 for which if y_1 were an electrician, then y_1 is rich can be inferred via the existential biconditional elimination rule.