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 will take a plane. There is at least one x_7 for which x_7 will work if and only if x_7 will drink water. For all x_7, if x_7 drinks water, then x_7 is not taking a plane.
For all x_7, x_7 will not drink water. There is at least one x_7 for which if x_7 works, then x_7 is drinking water. There is at least one x_7 for which if x_7 drinks water, then x_7 is working.