Two dogs playing on grass.
Two mammals in the grass.
Dogs are mammals.
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 x1 x2.(n_grass(x2) & a_topic(x1) & in(x1,x2) & n_mammal(x1) & card_eq_2(x1))