Two dogs bite at each other on the carpet.
two dogs are biting
Dogs who bite at each other are biting.
exists e1 x1 x2.(n_carpet(x2) & on(e1,x2) & all x3.(n_other(x3) -> at(e1,x3)) & Actor(e1,x1) & v_bite(e1) & n_dog(x1) & card_eq_2(x1))
exists e1 x1.(Actor(e1,x1) & v_bite(e1) & n_dog(x1) & card_eq_2(x1))