Two dogs run through the snow.
A wolf howls at the moon.
Two dogs are not a wolf.
exists e1 x1 x2.(n_snow(x2) & through(e1,x2) & Actor(e1,x1) & v_run(e1) & n_dog(x1) & card_eq_2(x1))
exists e1 x1 x2.(n_moon(x2) & at(e1,x2) & Actor(e1,x1) & v_howl(e1) & n_wolf(x1))