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, z is curious or z is not a nurse. For all z, z is a server. There is at least one z for which z is a nurse.
Some nurses are servers can be inferred via the existential conjunction rule. Some servers are nurses can be inferred via the existential conjunction rule. For all z, if z were a nurse, then z is curious can be inferred via the universal rewriting rule.