What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all x_9, x_9 will make tea if and only if x_9 will take a plane. Jessica is driving a car if and only if David is making tea. For all x_9, x_9 will not take a plane.
If Jessica drives a car, then David is making tea. If David makes tea, then Jessica is driving a car. For all x_9, if x_9 makes tea, then x_9 is taking a plane. For all x_9, if x_9 takes a plane, then x_9 is making tea. For all x_9, x_9 will not make tea.