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