The horse on the left is brown.
There is only one horse and it is white
Whether the horse is brown or white.
exists s1 x1 x2.(n_left(x2) & n_horse(x1) & Theme(s1,x1) & a_brown(s1) & on(x1,x2))
exists p1 s1 x1 x2.(n_thing(x2) & Theme(s1,x2) & a_white(s1) & exists x3.((x1 = x3) & n_horse(x3) & card_eq_1(x3) & r_only(x3)))