What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all z_1, if z_1 reads a book, then z_1 is a taxi driver. For all z_1, z_1 will work if and only if z_1 will read a book. For all z_1, z_1 is not a taxi driver. There is at least one z_1 for which z_1 will work if and only if z_1 will play squash.
For all z_1, z_1 will not read a book. For all z_1, if z_1 works, then z_1 is reading a book. There is at least one z_1 for which if z_1 works, then z_1 is playing squash. For all z_1, if z_1 reads a book, then z_1 is working. There is at least one z_1 for which if z_1 plays squash, then z_1 is working.