What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? Name the inference rule being used: Jessica is not cooking. For all x_6, if x_6 were a writer, then x_6 is cooking. For all x_6, x_6 will cook if and only if x_6 is a writer.
For all x_6, if x_6 cooks, then x_6 is a writer can be inferred via the universal biconditional elimination rule. For all x_6, if x_6 were a writer, then x_6 is cooking can be inferred via the universal biconditional elimination rule.