What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? Michael is not a server. Joseph is poor if and only if it is overcast. Linda is a taxi driver if and only if Michael is a server. Joseph is not poor.
Michael is not a server and Joseph is not poor. Joseph is not poor and Michael is not a server. If Joseph were poor, then it is overcast. If Linda were a taxi driver, then Michael is a server. If it is overcast, then Joseph is poor. If Michael were a server, then Linda is a taxi driver. It is not overcast. Linda is not a taxi driver.