Four women in yellow dresses are performing a ballet.
The women are wearing black.
Yellow dresses cannot be black.
exists e1 s1 x1 x2 x3.(Theme(e1,x3) & Actor(e1,x1) & v_perform(e1) & n_ballet(x3) & in(x1,x2) & n_dress(x2) & a_yellow(s1) & Theme(s1,x2) & n_woman(x1) & card_eq_4(x1))
exists e1 p1 x1.(n_woman(x1) & exists s1.(Theme(s1,x1) & a_black(s1)) & Topic(e1,p1) & Actor(e1,x1) & v_wear(e1))