What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all x_4, x_4 will cook if and only if x_4 is a writer. For all x_4, if x_4 were a writer, then x_4 is cooking. For all x_4, x_4 is not a writer.
For all x_4, if x_4 cooks, then x_4 is a writer. For all x_4, if x_4 were a writer, then x_4 is cooking. For all x_4, x_4 will not cook.