Two workers cooking at a food stand.
Two workers are cooking in a restaurant.
The workers cannot be at a food stand and in a restaurant at the same time
exists e1 x1 x2 x3.(at(e1,x2) & n_stand(x2) & of(x2,x3) & n_food(x3) & Actor(e1,x1) & v_cook(e1) & n_worker(x1) & card_eq_2(x1))
exists e1 x1 x2.(in(e1,x2) & n_restaurant(x2) & Actor(e1,x1) & v_cook(e1) & n_worker(x1) & card_eq_2(x1))