What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all z, if z were a writer, then z is curious. There is at least one z for which if z were curious, then z is cooking. For all z, z will work if and only if z is a writer.
There is at least one z for which if z were a writer, then z is cooking. For all z, if z works, then z is a writer. For all z, if z were a writer, then z is working.