What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all z_4, if z_4 cooks, then z_4 is poor. There is at least one z_4 for which z_4 is poor if and only if z_4 will cook.
There is at least one z_4 for which if z_4 were poor, then z_4 is cooking. There is at least one z_4 for which if z_4 cooks, then z_4 is poor.