The three girls are sitting down the set.
The girls are standing.
Standing girls can't be sitting down.
exists e1 x1 x2.(n_set(x2) & n_girl(x1) & card_eq_3(x1) & down(e1,x2) & Actor(e1,x1) & v_sit(e1))
exists e1 x1.(n_girl(x1) & Actor(e1,x1) & v_stand(e1))