The horse on the right is red.
There is multiple horses in this photo
If there are multiple horses, there must be a horse.
exists s1 x1 x2.(n_right(x2) & n_horse(x1) & Theme(s1,x1) & a_red(s1) & on(x1,x2))
exists p1 x1 x3.(n_photo(x3) & exists s1 x2.((x1 = x2) & in(x2,x3) & n_horse(x2) & a_multiple(s1) & Theme(s1,x2)))