What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all y_4, y_4 will sleep if and only if y_4 will cook. If Richard cooks, then Richard is sleeping.
For all y_4, if y_4 sleeps, then y_4 is cooking. For all y_4, if y_4 cooks, then y_4 is sleeping.