Dogs chase each other.
Dogs run after other
Dogs must run to chase each other.
exists x1 x2.(a_topic(x1) & all x3.(n_other(x3) -> exists s1.(Theme(s1,x3) & Actor(s1,x2) & a_chase(s1))) & (x1 = x2) & n_dog(x1))
exists e1 x1 x2.(after(e1,x2) & n_other(x2) & Actor(e1,x1) & v_run(e1) & n_dog(x1))