What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? There is at least one z_2 for which if z_2 were a carpenter, then z_2 is reading a book. For all z_2, z_2 will not read a book. For all z_2, if z_2 reads a book, then z_2 is a carpenter.
There is at least one z_2 for which z_2 is not a carpenter. There is at least one z_2 for which z_2 is a carpenter if and only if z_2 will read a book. There is at least one z_2 for which z_2 will read a book if and only if z_2 is a carpenter.