Two dogs are running through the surf.
Dogs running through something.
The surf is a something.
exists e1 x1 x2.(n_surf(x2) & through(e1,x2) & Actor(e1,x1) & v_run(e1) & n_dog(x1) & card_eq_2(x1))
exists e1 x1 x2 x3.(a_topic(x1) & through(e1,x3) & n_thing(x3) & Actor(e1,x2) & v_run(e1) & (x1 = x2) & n_dog(x1))