Two girls talking while sitting on the stairs.
Two girls wearing matching dresses
Two girls talking while sitting on the stairs does not necessary that they are wearing matching dresses
exists e2 e1 x1 x2 x3.(n_stair(x3) & a_topic(x1) & while(e1,e2) & on(e2,x3) & Actor(e2,x2) & v_sit(e2) & Actor(e1,x2) & v_talk(e1) & (x1 = x2) & n_girl(x1) & card_eq_2(x1))
exists e1 s1 x1 x2 x3.(a_topic(x1) & Theme(e1,x3) & Actor(e1,x2) & v_wear(e1) & n_dress(x3) & a_matching(s1) & Theme(s1,x3) & (x1 = x2) & n_girl(x1) & card_eq_2(x1))