There are 4 horses in the photo.
People are riding four horses in the photo.
4 horses does not mean people are riding four horses.
exists p1 x1 x2.(n_photo(x2) & in(p1,x2) & exists x3.((x1 = x3) & n_horse(x3) & n_date(x3) & a_date_day_04(x3) & a_date_day_04(x3)))
exists e1 x1 x2 x3.(n_photo(x3) & in(e1,x3) & Theme(e1,x2) & Actor(e1,x1) & v_ride(e1) & n_horse(x2) & card_eq_4(x2) & n_people(x1))