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 plays squash, then z_4 is playing a game. For all z_4, z_4 will play a game if and only if z_4 will play squash. For all z_4, z_4 will work if and only if z_4 will play squash. For all z_4, z_4 will not work.
For all z_4, if z_4 plays a game, then z_4 is playing squash. For all z_4, if z_4 works, then z_4 is playing squash. For all z_4, if z_4 plays squash, then z_4 is playing a game. For all z_4, if z_4 plays squash, then z_4 is working. For all z_4, z_4 will not play squash.