What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all x_20, x_20 will not play tennis. For all x_20, x_20 will play tennis or x_20 will not work. Jennifer is playing a game if and only if Robert is working.
If Jennifer plays a game, then Robert is working. If Robert works, then Jennifer is playing a game. For all x_20, if x_20 works, then x_20 is playing tennis.