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