Two German shepherds playing with a stick.
The dogs are playing with a ball.
A ball is not a stick.
exists e1 s1 x1 x2 x3.(a_topic(x1) & with(e1,x3) & n_stick(x3) & Actor(e1,x2) & v_play(e1) & (x1 = x2) & n_shepherd(x1) & a_german(s1) & Theme(s1,x1) & card_eq_2(x1))
exists e1 x1 x2.(n_dog(x1) & with(e1,x2) & n_ball(x2) & Actor(e1,x1) & v_play(e1))