Two dogs are running on a beach.
Two dogs run across the sand.
A beach is made of sand, and running on a beach implies the dogs run across the sand.
exists e1 x1 x2.(on(e1,x2) & n_beach(x2) & Actor(e1,x1) & v_run(e1) & n_dog(x1) & card_eq_2(x1))
exists e1 x1 x2.(n_sand(x2) & across(e1,x2) & Actor(e1,x1) & v_run(e1) & n_dog(x1) & card_eq_2(x1))