What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? If Joseph were not an artist, then it is overcast. Joseph is not reading a book. Joseph is an artist if and only if Joseph is reading a book. For all z, z is happy.
If Joseph were an artist, then Joseph is reading a book. If Joseph reads a book, then Joseph is an artist. Joseph is not an artist.