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