What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? It is overcast. It is late. Barbara is reading a book.
It is overcast and it is late. It is overcast and Barbara is reading a book. It is late and it is overcast. It is late and Barbara is reading a book. Barbara is reading a book and it is overcast. Barbara is reading a book and it is late.