What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all z_2, z_2 is happy or z_2 will not cook. There is at least one z_2 for which z_2 will not cook. For all z_2, z_2 will cook or z_2 is not happy.
For all z_2, if z_2 cooks, then z_2 is happy. For all z_2, if z_2 were happy, then z_2 is cooking.