Two greyhounds race
The two dogs are eating their food.
If they race, they are not eating food.
exists x1 x2.(n_race(x1) & of(x1,x2) & n_greyhound(x2) & card_eq_2(x1) & a_topic(x1))
exists e1 x1 x2.(n_food(x2) & of(x2,x1) & n_thing(x1) & n_dog(x1) & card_eq_2(x1) & Theme(e1,x2) & Actor(e1,x1) & v_eat(e1))