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 take a plane if and only if y_4 will sleep. For all y_4, if y_4 were a lawyer, then y_4 is sleeping. For all y_4, y_4 is a lawyer or y_4 will not work.
For all y_4, if y_4 works, then y_4 is a lawyer. For all y_4, if y_4 takes a plane, then y_4 is sleeping. For all y_4, if y_4 sleeps, then y_4 is taking a plane.