What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? If Robert were a taxi driver, then it is cloudy. Karen is playing tennis or Jessica is not a doctor. If Karen plays tennis, then Robert is a taxi driver. It is cold or Jessica is a doctor. It is cloudy if and only if it is cold.
If Karen plays tennis, then it is cloudy. If Jessica were a doctor, then Karen is playing tennis. If it is cloudy, then it is cold. If it is cold, then it is cloudy.