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: For all x_6, x_6 will play a game if and only if x_6 is an astronaut. There is at least one x_6 for which x_6 is an astronaut. For all x_6, x_6 will not play a game.
Since the premises are contradictory, we can infer anything from them.