A police officer on a horse stands in front of a red brick, multistory building.
the horse is white
A police officer's horse could be any colour, not necessarily white.
exists e1 s1 s2 x1 x2 x3 x4 x5 x6.(in(e1,x4) & of(x4,x5) & rel(x5,x6) & n_building(x6) & a_multistory(s2) & Theme(s2,x6) & n_brick(x5) & a_red(s1) & Theme(s1,x5) & n_front(x4) & Actor(e1,x1) & v_stand(e1) & on(x1,x3) & n_horse(x3) & n_officer(x1) & of(x1,x2) & n_police(x2))
exists s1 x1.(n_horse(x1) & Theme(s1,x1) & a_white(s1))