What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all x_12, x_12 will take a plane if and only if x_12 will go running. Robert is not playing a game. James is running if and only if Robert is playing a game.
If James goes running, then Robert is playing a game. If Robert plays a game, then James is running. James is not running. For all x_12, if x_12 takes a plane, then x_12 is running. For all x_12, if x_12 goes running, then x_12 is taking a plane.