What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? If Karen were a soldier, then it is overcast. If Karen writes a letter, then David is reading a book. If it is overcast, then Karen is writing a letter. If Linda were a scientist, then Karen is a soldier. If David reads a book, then Linda is a scientist.
If Karen were a soldier, then Karen is writing a letter. If Karen writes a letter, then Linda is a scientist. If it is overcast, then David is reading a book. If Linda were a scientist, then it is overcast. If David reads a book, then Karen is a soldier.