Two dogs fight or play in a field.
Two cats are fighting in the field.
Cats and dogs are different.
(exists x1 x2.(a_topic(x1) & n_fight(x1) & of(x1,x2) & n_dog(x2) & card_eq_2(x1)) | exists x3 x4.(a_topic(x3) & in(x3,x4) & n_field(x4) & n_play(x3)))
exists e1 x1 x2.(n_field(x2) & in(e1,x2) & Actor(e1,x1) & v_fight(e1) & n_cat(x1) & card_eq_2(x1))