A football game.
A hockey game.
football game is play on a field and hockey game is play on ice.
exists x1 x2.(a_topic(x1) & n_game(x1) & of(x1,x2) & n_football(x2))
exists x1 x2.(a_topic(x1) & n_game(x1) & of(x1,x2) & n_hockey(x2))