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, z_4 is not fast. For all z_4, if z_4 were an artist, then z_4 is a taxi driver. For all z_4, z_4 will drink water if and only if z_4 is fast. There is at least one z_4 for which if z_4 were a taxi driver, then z_4 is drinking water.
There is at least one z_4 for which if z_4 were an artist, then z_4 is drinking water. For all z_4, if z_4 drinks water, then z_4 is fast. For all z_4, if z_4 were fast, then z_4 is drinking water. For all z_4, z_4 will not drink water.