Two girls are standing behind another girl.
Three girls are standing near each other.
Two girls with another girl equals three girls.
exists e1 x1 x2.(behind(e1,x2) & n_girl(x2) & -(x2 = x1) & n_girl(x1) & n_girl(x1) & Actor(e1,x1) & v_stand(e1) & card_eq_2(x1))
exists e1 x1.(all x2.(n_other(x2) -> near(e1,x2)) & Actor(e1,x1) & v_stand(e1) & n_girl(x1) & card_eq_3(x1))