What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? Thomas is a politician if and only if it is overcast. Patricia is working if and only if it is overcast. If Thomas were a politician, then Patricia is working.
If Thomas were a politician, then it is overcast. If Patricia works, then it is overcast. If it is overcast, then Thomas is a politician. If it is overcast, then Patricia is working.