Two dark-haired girls are in a crowd.
Two sisters walk through a crowd.
Not all girls are sisters and nothing says they are walking through the crowd.
exists p1 s1 x1.(exists x2.(in(x1,x2) & n_crowd(x2)) & n_girl(x1) & a_dark-haired(s1) & Theme(s1,x1) & card_eq_2(x1))
exists e1 x1 x2.(through(e1,x2) & n_crowd(x2) & Actor(e1,x1) & v_walk(e1) & n_sister(x1) & card_eq_2(x1))