Two dogs playing on grass.
Two dog siblings playing in the grass.
The dogs are not necessarily siblings
exists e1 x1 x2 x3.(a_topic(x1) & on(e1,x3) & n_grass(x3) & Actor(e1,x2) & v_play(e1) & (x1 = x2) & n_dog(x1) & card_eq_2(x1))
exists e1 x1 x2 x3 x4.(n_grass(x4) & a_topic(x1) & in(e1,x4) & Actor(e1,x3) & v_play(e1) & (x1 = x3) & n_sibling(x1) & of(x1,x2) & n_dog(x2) & card_eq_2(x1))