What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? It is overcast if and only if Jessica is a writer. If it is overcast, then Susan is a police officer. For all x_20, if x_20 were sad, then x_20 is a writer. If Susan were a police officer, then Jessica is sad.
If it is overcast, then Jessica is sad. If it is overcast, then Jessica is a writer. If Jessica were a writer, then it is overcast.