Two dogs play in the grass.
cats chase mice
Dogs and cats are two different species of animal.
exists x1 x2 x3.(n_grass(x3) & a_topic(x1) & in(x1,x3) & n_play(x1) & of(x1,x2) & n_dog(x2) & card_eq_2(x1))
exists s1 x1 x2.(n_mouse(x1) & a_chase(s1) & Theme(s1,x1) & of(x1,x2) & n_cat(x2) & a_topic(x1))