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 z_1, if z_1 were curious, then z_1 is cooking. There is at least one z_1 for which if z_1 were happy, then z_1 is taking a plane. For all z_1, z_1 is curious or z_1 will not take a plane.
For all z_1, if z_1 takes a plane, then z_1 is curious can be inferred via the universal rewriting rule.