What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all x_7, x_7 is a cashier. For all x_7, if x_7 drinks water, then x_7 is not taking a plane. For all x_7, if x_7 were a cashier, then x_7 is taking a plane. For all x_7, if x_7 drinks water, then x_7 is cooking. There is at least one x_7 for which if x_7 cooks, then x_7 is drinking water.
For all x_7, x_7 will take a plane. There is at least one x_7 for which x_7 will cook if and only if x_7 will drink water. There is at least one x_7 for which x_7 will drink water if and only if x_7 will cook.