What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? Jessica is reading a book. For all z_4, z_4 is a scientist if and only if z_4 will read a book.
There is at least one x for which x will read a book. For all z_4, if z_4 were a scientist, then z_4 is reading a book. For all z_4, if z_4 reads a book, then z_4 is a scientist.