The horse on the left is brown.
The left horse is white.
Either the horse on the left is brown or white.
exists s1 x1 x2.(n_left(x2) & n_horse(x1) & Theme(s1,x1) & a_brown(s1) & on(x1,x2))
exists s1 s2 x1.(n_horse(x1) & a_left(s1) & Theme(s1,x1) & Theme(s2,x1) & a_white(s2))