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: There is at least one z_1 for which if z_1 listens to a song, then z_1 is playing squash. For all z_1, z_1 will listen to a song or z_1 will not play squash.
For all z_1, if z_1 plays squash, then z_1 is listening to a song can be inferred via the universal rewriting rule.