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