two girls in white dresses standing by large horses.
A double wedding takes place on horseback
Not all girls in white dresses are in a wedding.
exists e1 s1 s2 x1 x2 x3 x4.(a_topic(x1) & in(x1,x2) & by(e1,x4) & n_horse(x4) & a_large(s2) & Theme(s2,x4) & Actor(e1,x3) & v_stand(e1) & (x2 = x3) & n_dress(x2) & a_white(s1) & Theme(s1,x2) & n_girl(x1) & card_eq_2(x1))
exists e1 s1 x1 x2 x3.(on(e1,x3) & n_horseback(x3) & Theme(e1,x2) & Actor(e1,x1) & v_take(e1) & n_place(x2) & n_wedding(x1) & a_double(s1) & Theme(s1,x1))