Two dogs interacting with each other.
Two dogs together.
Dogs can't interact with themselves, but can together.
exists e1 x1 x2.(a_topic(x1) & all x3.(n_other(x3) -> with(e1,x3)) & Actor(e1,x2) & v_interact(e1) & (x1 = x2) & n_dog(x1) & card_eq_2(x1))
exists x1.(a_topic(x1) & r_together(x1) & n_dog(x1) & card_eq_2(x1))