What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? Name the inference rule being used: Jennifer is taking a plane if and only if Jessica is playing a game. For all x_5, x_5 will not take a plane.
If Jennifer takes a plane, then Jessica is playing a game can be inferred via the biconditional elimination rule. If Jessica plays a game, then Jennifer is taking a plane can be inferred via the biconditional elimination rule.