What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? There is at least one x_7 for which x_7 will take a plane or x_7 will play a game. For all x_7, x_7 will not make tea. For all x_7, x_7 will make tea if and only if x_7 will work. For all x_7, x_7 will work if and only if x_7 will take a plane.
For all x_7, if x_7 makes tea, then x_7 is working. For all x_7, if x_7 works, then x_7 is taking a plane. For all x_7, if x_7 works, then x_7 is making tea. For all x_7, if x_7 takes a plane, then x_7 is working. For all x_7, x_7 will not work.